Your source is the LCMS who also publicly promulgates this:
As to the Antichrist we teach that the prophecies of the Holy Scriptures concerning the Antichrist, 2 Thess. 2:3-12; 1 John 2:18, have been fulfilled in the Pope of Rome and his dominion. All the features of the Antichrist as drawn in these prophecies, including the most abominable and horrible ones, for example, that the Antichrist “as God sitteth in the temple of God,” 2 Thess. 2:4; that he anathematizes the very heart of the Gospel of Christ, that is, the doctrine of the forgiveness of sins by grace alone, for Christ’s sake alone, through faith alone, without any merit or worthiness in man (Rom. 3:20-28; Gal. 2:16); that he recognizes only those as members of the Christian Church who bow to his authority; and that, like a deluge, he had inundated the whole Church with his antichristian doctrines till God revealed him through the Reformation — these very features are the outstanding characteristics of the Papacy. (Cf. Smalcald Articles, Triglot, p. 515, Paragraphs 39-41; p. 401, Paragraph 45; M. pp. 336, 258.) Hence we subscribe to the statement of our Confessions that the Pope is “the very Antichrist.” (Smalcald Articles, Triglot, p. 475, Paragraph 10; M., p. 308.)
Being Catholic has nothing to do with anything. When you cite a source that not only decries the Papal Office, but publicly claims the Pope of being the anti-christ, then your source is not credible.