They are, sort of. They use the bible as their sole source of authority. But they ignore any section of it that they don't like.
Then they are no Sola Scripturists (Yeah I made that word up, but it fits). They are using their own authority to decide what is right and wrong.
If it is one he/she is his/ her own pope. If it is two or more they are their own magisterium. How is this the slightest bit different than what the protestants bang the Catholics heads over?
It isn't not in the least.