Here's a link to the only SNL sketch I'm aware of that mentions the Platinum Lounge: https://www.youtube.com/watch?v=r5asa2Ot1Fc (from S32E05 Alec Baldwin/Christina Aguilera, 11/11/2006). Very early in the sketch, Maya Rudolph indicates that Platinum Lounge members "have to have hosted 12 [or more] times". There's no mention at all of earning that status with the help of musical performances or special guest appearances.
So far I can't find any sign that the Platinum Lounge was mentioned in any other SNL sketch. a) If another sketch does mention the Platinum Lounge, could someone please provide a source? b) If there is no such sketch, then the "Platinum Lounge Member" category page needs appropriate editing and Chevy Chase (an 8-time host) needs to be removed from the category. Thanks!
(P.S. Can you all see my username? If not, it is "James B W Bevis."