That’s nonsense. There will always be false denominations because there will always be false teachers as Jesus, Paul, Peter, John and Jude warned us. That some may misinterpret the same scripture Peter described as “difficult to understand” is not an argument against it being the sole infallible rule of faith.
You prove my point. YOU are saying that your denomination is the correct one. Think all of those other denominations read the Bible, said screw it, and denied the clear meaning that Sola Scriptura is supposed to automatically convey?
You have no authority to say anything about anyone else because for Protestantism every person is a faith into themselves. And that is why the only thing protestants agree upon us that they think the Catholic Church is wrong.
And that should tell you everything about Sola Scriptura. Breeds dissent, division and schism