That's true.
But what he said is that the Articles ARE Anglicanism.
That's also true.
When we come to saying that they are binding or they are not binding, what is meant is that no one is going to be expelled or excommunicated for disagreeing with them. However, they remain the statement of faith of our church.
IOW, I could say that I don't feel in any way in agreement with the part in the national anthem in which it is said that ours is "the land of the free," but that attitude of mine wouldn't make the Star Spangled Banner NOT the nation's anthem.
A national anthem does not make a nation, which invariably encompasses people of beliefs in complete opposition, sometimes with a majority in complete opposition to a small minority who decide on the choice of national anthem. A modern belief organisation is
elective by nature, normally
defined by its beliefs, enshrined in its formularies that normally require formal assent. A far better analogy would be that of organisations of single issue movements, such as one opposed to say, tobacco use. Now a member of such an organisation that suddenly proposed that tobacco is harmless, or who even defended the use of tobacco, would not be acceptable by that organisation. Such a person in a position of remunerated responsibility would promptly lose that position without redress, and would fully expect to do so.
Not so in Anglicanism and Episcopalianism today. At one time, the Anglican ministry was required by law to not only assent to Anglican formularies, but to regulate its behaviour according to those formularies. Society changed, and Anglicanism changed with it. Anglicanism took on a pluralist nature
because it was a national church, and a perceived need to be inclusive, now that legislation could not be applied, made for an assumed identity of Englishness with Anglicanism until WW2 and beyond. All manner of beliefs became unremarked part and parcel of an institution. These are not only tolerated in Anglicans, they have been encouraged by senior Anglicans. (Even more so by senior Episcopalians, whose motive cannot be the same, and which deserves some scrutiny). There are Anglicans who object to this waywardness, describing it as anomalous, because CoE clergy are still required to swear an oath of subscription to the Articles. (It is probable that the majority of active members of the Communion worldwide are served by clergy who have signed assent to the Articles, and indeed probable that a majority of signatories adhere pretty well to the Articles, too, so the view common in the USA is perhaps parochial and not as representative as may be supposed. So there is actually some sort of practical truth to the claim that the Articles define Anglicanism, but it is certainly not for Americans to make it.)
For the reason given, English Anglicanism has long enjoyed/suffered the reputation of being a tolerant society, a kaleidoscopic pool of every sort of belief (bar fundamentalism), though Episcopalianism is now somewhat infamous for eclipsing even Anglican variety, or perhaps it is the sheer determination to be different that marks it out. It is therefore remarkable if Episcopalians lay claim to
any common core belief that distinguishes their organisation from many others. It certainly ill becomes Episcopalians to even mention the 39 Articles of Religion, because in 1979 they officially declared them of historic interest only, and in 2003 even refused to recognise the authority of Scripture. It may even be muttered, and it has been, that ECUSA is no longer really part of the Anglican Communion, or of any other possible desirable alliance, for these very reasons.
However, it may be argued, even if ECUSA has abandoned the Articles, it still feels their force, because, when push comes to shove on matters of discipline, the combined global episcopate recognises them, and applies them to ECUSA, whether it recognises them, whether it likes it, or not. And that can hardly be denied.
Despite this, one may yet be Anglican or Episcopalian and refuse to believe in virgin birth, in incarnation, in miracles, in Old Testament histories, in Paul's letters, in many or all of the Articles according to one's lights- and quite a few do. Anglicans and Episcopalians may believe that Allah is as valid a deity as Vishnu, who is as valid a deity as Mahavira, who is as valid a deity as Christ- and some do. One may even, as an up-and-coming curate long ago confided to me, be unsure that a deity exists at all. So one cannot say that to be an Anglican, even a 'successful' one, one has to be very particular about what one believes.
Having said that, one can find today almost as much variety of belief among Methodists, Presbyterians and even Roman Catholics as one can in Anglicanism. It's just a symptom of the Western condition, and if Eastern Orthodoxy can gloat, it's only because it is Eastern, and has yet to experience the full temptation of modernity, including democracy.