Angelus Press is an apostolate of the SSPX - they publish various Catholic books and pamphlets that it wouldn’t be uncommon to see at your average Catholic bookstore. They don’t shy away from their association with the Fraternity and have published books about Archbishop +Lefebvre and whatnot. Their address is located just down the street from the SSPX’s St Vincent de Paul Church & Priory in Kansas City, MO. I’ve never read the magazine but I do regularly use their daily hand missal at the Tridentine Mass and for my own devotions. Nothing polemical to be found in that book, though I’m sure the opinions of the SSPX Bishops, Fathers, and associated laypeople can be found throughout some of their other publications.