I wouldn't suggest this is THE Roman Catholic explanation, though I think it is a good one and one that squares roughly with our understanding as well. There are things in there about the role of the diaconate and its development over time, as well as omissions such as the priest as an icon of Christ, that I would want to discuss. And I also don't think the Scriptural admonitions about public teaching are not reasons simply because he did not discuss them.
In any event, our Roman Catholic friends can speak for themselves. If anything, it seems to me the discussion is unlikely to bear fruit for two reasons:
1). Roman Catholics, as we do, have a respect for Holy Tradition that need not be justified by arguments from sola Scriptura; and
2). If one wishes to make an argument that because Roman Catholics do not use Scripture to justify their reasoning on this issue, therefore, Protestants should not either, that seems to be both backwards and self-refuting. I doubt, for example, a similar argument would be made about the Episcopacy or ecclesiology. It's too convenient and ignores that sola Scriptura is one of the main lines of division between Roman Catholics (and us) and Protestants.