I can't imagine a company that has a good reputation like they (Pro Products) do would run around making false claims. And you'll notice Reptile basics makes no claims that theirs are UL certified. I have emailed Bob asking for proof that I can post. I'll let you know when I hear back from him.
And as far as the "popcorn", it is not rough at all. Nothing that could/would hurt your snake. They aren't so much popcorn as textured. Again, nothing that could hurt your snake.