Yeah, that’s pretty much it for John of St. Thomas. It’s really a shame because he was probably one of the greatest Thomists of all time, and his philosophy was extremely advanced. Mostly everyone except Bonaventure, Aquinas, Scotus, Ockham, and Suarez are untranslated. Excluding Saint Thomas, even with them the majority of their stuff is untranslated.
It’s very unfortunate this lack of care and translation of scholastic philosophy. Anyways, I recommend learning Latin. I know that’s not a casual recommendation, but it’s sort of essential if you really want to get into medieval philosophy. There’s a whole universe of scholasticism other than Saint Thomas; it’s just stuck in Latin! Besides, Latin is the language of the Roman Rite, the Vatican City, as well as of all the papal encyclicals, the early Latin Fathers, and Saint Jerome’s classic Biblia Vulgata.
If you do get into Latin, make sure you bookmark
this site. It’s a text of John of St. Thomas.