I think, to be more precise, it was the approval of “already approved 3rd party developer’s” , new and update products that was talked about in the Q&A is being backlogged, and that they, MS were bringing more on-board to deal with the evaluation & approval of product (not the approval of NEW Market Place Devs )
Apart form quoting numbers of approved devs, I do not recall that there was any specific mention of new Dev approvals being backlogged.
Obviously through, there are certain exceptions to that, RXP seeming to be one of them .
Has RXP tried re-applying, along with a suitable Market-Place product ?
Maybe their original application got lost somewhere ?