I kind of feel like if you're using a "Random text generator based on probability" for something that you need to trust, you're kind of holding this tool wrong.

I wouldn't complain a RNG doesn't return the numbers I want, so why complain you don't get 100% trusted output from a random text generator?

Because people provide that work without acknowledging it was created by a RNG, representing it as their own and implying some of level of assurance that it is actually true.