There is no objective definition of a "True Scotsman", to which a third party can refer.
The Catholic Faith, in its creed, dogmas, and doctrines, IS objectively (and extensively) defined. You don't have to like it. You don't have to agree with it. You don't even have to think it's "biblical". What you CAN'T do, honestly, is claim that nobody can knows what it really is.
And that's the problem with Mr. Bergoglio: he consistently contradicts things that anybody can see are well established, well documented, articles of the Catholic Faith.
If you admin that the Catholic Church has EVER changed ANY of their creeds dogmas or doctrines, then you would admit that these things are changeable and are whatever the current administration says they are.
If the current Pope and Bishops want to allow or even require gay or transgender Priests, then that will be the new official position of the church.
Anyone disagreeing with that stance will no longer be Catholic.