I read an interesting interview with head of Comics curating? Sales? of Heritage Auction covering boom in sales & prices. One of the things that stood out to me is the off hand comment, "The auction results were led by a new “pedigree” collection called The Promise Collection, featuring nearly 5,000 comics..."
Considering how there was a brief hiatus in InHouse Signings and TATs were still increasing, I honestly believe CGC put everything on hold to process the Promise Pedigree books and get them on block ASAP. Now that they (or bulk) have cleared, we can hopefully have rest of organization catch up. Fingers crossed.
https://www.forbes.com/sites/robsalkowitz/2021/06/23/what-the-hell-is-going-on-in-the-collectible-comics-market/?sh=7d620db6307c