Regardless of the term, what Mathison is describing is a real epistemological difference. Don't like the term, don't use it. Like any term it is simply a way to encode a concept, a point of view, into a manageable linguistic package. But the point is, yes there is a very real difference in how one approaches and uses Scripture and the term is simply one of convenience to make it clear how one likely interprets Scripture (or tries to). There is a very real difference between someone who rejects any other epistemological sources outside of ones personal interpretation of Scripture and a church who recognizes the need and usefulness of other sources, but limits their ability to bind one's conscience on essential matters.
For more information, I'd refer you to
the first video in
this series. It covers all these views along with Roman Catholic and Eastern Orthodox views.
As for the article, I've discussed these elsewhere somewhere here in GT and it's basically making the same silly claim that there's really no difference between the two points of view in the end, because you still need an authority. But this is absurd because there are real tangible differences that can be demonstrated. Also, what Mathison calls sola scriptura recognizes the place and authority of the church, and so the argument only succeeds in trashing up some hay and avoiding the real issue the Reformers died for. Protestants are completely aware that the real issue is one of authority, but insist that sola scriptura is the only effective method to resolve the question,
what happens when the church becomes radically corrupt and refuses to reform? Of course the RCC and EO would no doubt claim such a thing is ultimately impossible and point to Matt 16:18 as proof. Other Christians look at the entire course of God's interaction with humans as recorded in Scripture and see that although God will indeed preserve His elect, He does not make any promises to any one tribe that it is or even will remain His unique source of grace as He not only constantly warns them of corruption, but repeatedly took power away from a tribe or group only to give it to another. For us folks, the idea that Christ setup a "One True Church" in the sense that only a single sect (like RCC or EO) represents this One True Church, is simply not a biblical concept and thus, since parts of the church can always fall from grace, why we must have a way to deal with corruption when it inevitably arises (which amusingly enough, both RCC and EO agree exists and which each points at the other as an example of this). We believe that only sola scriptura can effectively deal with this situation as we move farther and farther away from the sources of these unwritten traditions and as the pile of them continues to grow and grow.
But again, see links for more info since I think you're basically beating a dead horse here brother and I really don't feel the need to repeat what we've discussed over and over in other threads. Take the term or leave it, the terms express a difference as real as the differences between RCC and EO Christians. Sola scriptura, again, take it or leave it. If you do reject it, as you no doubt do, just be prepared to submit to the authority of The Church on any given belief or practice, regardless of the arguments against them. You can appeal to Scripture, reason, other tradition, quote Fathers till you're blue in the face, appeal to science and even common sense. In the end, you are basically agreeing to do and believe whatever you are told, because you believe that The Church simply can't completely fall into corruption. And we're back to the tautology we've repeated again and again:
Truth is what we say is truth because we're the One True Church because we say we're the One True Church.
God bless and hope this helps!