I'm not willing to find out but I very much doubt they can back up the claims either. They're useless at everything else, why would they be any good at this one specific thing? More than likely it's like every other aspect of their existence, they put in 1/3 of the required effort, are hopeless at it and cling onto anything that might indicate otherwise as tacit approval and confirmation of how amazing they are. In this case, that last part is assuming that climax = a good blowjob. It doesn't.