Typhoon Not saying it's not true, but Ping might have just been promoting product.
If it were illegal in any way/shape/form....how did it pass as conforming? It's not like changing a grip on a club and it becomes non-conforming due to the grip being such, this is an actual part of the club.
I'm doubting something........
The USGA does check MOI. imo, if the club head had movable weights, they would move weights all around and check. I mean, they are assholes.