Interesting. People use it all the time - this is a really common brand in many of the GF communities. I suspect that one (or more) of three things is true: 1) they have no idea, 2) they don’t want to take on the liability, 3) people have complained about it not adhering and it has become an issue.
“Not recommending” something isn’t the same as saying it’s not safe. That said, a lot of people seem to have issues with that particular brand adhering (I can’t tell if it’s the product, the users, or a combination of both) so it doesn’t seem like a great loss.