You might want to investigate further. The link you provide says this:
"The Apocryphal books were accorded a deuterocanonical status, but were not regarded as canonical in the strict sense. That is, they were not accepted as authoritative for the establishing of doctrine but were used for the purpose of edification. Thus, the Church retained the distinctions established by Jerome, Rufinus and Athanasius of ecclesiastical and canonical books."
The first thing that is peculiar is why would Protestants take as their authority on such a matter Jerome, Rufinus, and Athanasius? Do these 3 men hold the authority in the same sense that a Catholic would refer to a Magisterium?
But second, let's examine these 3 fellows. Take
Athanasius. He writes:
There are, then, of the Old Testament, twenty-two books in number; for, as I have heard, it is handed down that this is the number of the letters among the Hebrews; their respective order and names being as follows. The first is Genesis, then Exodus, next Leviticus, after that Numbers, and then Deuteronomy. Following these there is Joshua, the son of Nun, then Judges, then Ruth. And again, after these four books of Kings, the first and second being reckoned as one book, and so likewise the third and fourth as one book. And again, the first and second of the Chronicles are reckoned as one book. Again Ezra, the first and second are similarly one book. After these there is the book of Psalms, then the Proverbs, next Ecclesiastes, and the Song of Songs. Job follows, then the Prophets, the twelve being reckoned as one book. Then Isaiah, one book, then Jeremiah with Baruch, Lamentations, and the epistle, one book; afterwards, Ezekiel and Daniel, each one book. Thus far constitutes the Old Testament.
A few observations. 1. He concludes that this "thus far" constitutes the Old Testament. 2. Where is Baruch in the Protestant canon? 3. Where is the "epistle" of Jeremiah in the Protestant canon? 4. Where is Esther in Athanasius' list? We read further:
But for greater exactness I add this also, writing of necessity; that there are other books besides these not indeed included in the Canon, but appointed by the Fathers to be read by those who newly join us, and who wish for instruction in the word of godliness. The Wisdom of Solomon, and the Wisdom of Sirach, and Esther, and Judith, and Tobit, and that which is called the Teaching of the Apostles, and the Shepherd. But the former, my brethren, are included in the Canon, the latter being [merely] read; nor is there in any place a mention of apocryphal writings. But they are an invention of heretics, who write them when they choose, bestowing upon them their approbation, and assigning to them a date, that so, using them as ancient writings, they may find occasion to lead astray the simple.
More observations. 1. Esther, which is in the Protestant canon, is listed among other books that Protestants call "apocrypha." 2. Athanasius
distinguishes these books from "apocryphal" writings.
Today, we speak of 2 classes of ancient Christian writing. It's either "canonical Scripture" or "uninspired Apocrypha." But Athanasius is using here three different classifications. The 22 books he calls "canonical" (which includes Baruch). Other Deuterocanonical books + Esther he says are not "canonical" but of "necessity" are "to be read" for "instruction in the word of godliness." These are
distinct from a third classification he calls "apocryphal." This is largely where the Protestant historian has erred (besides specious assignment of which ECFs they wish to consider authoritative).
So how can we know how Athanasius viewed the Deuterocanical books (besides Baruch which he said is canonical)? We look at how he uses them and references them.
But of these and such like inventions of idolatrous madness,
Scripture taught us beforehand long ago, when it said, The devising of idols was the beginning of fornication, and the invention of them, the corruption of life. (Athanasius,
Against the Heathen, #11)
That quote is from
Wisdom 14:12. And remember above how he had that book classified as "non-canonical." Yet he plainly refers to it as "Scripture." Those books he listed above as "non-canonical" he believed to be "Scripture." He had a different understanding of terms than we do today.
I could go on into Rufinus or Jerome, but this post is long enough.