I believe he is just blowing smoke but I am no expert, just a bowler who has had several run-ins with people saying that something was against USBC (or ABC) rules and I have learned that whenever they say that, just ask them to show you where in the rulebook. Most times they can't and the other times it is a mis-interpretation issue.
As for drilling certification, there is an outfit that provides the training and certification for proshops. Here is the link for that:
http://www.ibpsia.com/I am sure that someone with proshop experience will comment directly on this issue of yours.
Oh, and when we did have a proshop in our local center where I bowl, we had both good and bad drillers. So just drilling in a proshop is no guarantee of quality, you have to shop around and sometimes you will find a better driller in a home.