This has definitely been my experience. I've been in this hobby for nearly 11 years now... My overwhelming experience has been that providers don't seem to remember or know what they themselves put on their profile. I once was texting a provider to book him as for sex that included anal (he listed himself versatile for anal on his professional profile), in reply he told me he doesn't offer anal sex of any kind as part of his services. If I hadn't (double) checked and booked on the assumption his profile information was correct, it would have been quite a disappointing session. This has happened a number of times.
So the reason I ask things that are already on a provider's profile is because I've had enough experiences where there was either conflicting info or what is mentioned in the profile ended up not being accurate after talking to the provider or being in the room with him.