I have left the RGL AC team some time ago and I won't voice any personal thoughts on this particular case. However I can generally state that the AC staff has been struggling with activity even when I was still on the team trying to help out. The inactivity combined with their massive case backlog was one of my biggest concerns with the NA scene and quite demotivating, and with my other time commitments ultimately were the reason I left as I could no longer justify the time spent on it vs. what I got out of it.
The fault doesn't really lie with anyone in particular, it's more so that it seems there aren't many people who want to do this work, are qualified enough, and have enough free time. The ones who are available have other big commitments eating up their time, like Aad who afaik is very busy with site dev work. That being said alting cases are usually acted on much quicker. I would say another issue I noticed was the general workflow from a case getting reported to actually getting eyes on it, and a lot of workarounds being needed for staff work, for example requesting demos by having to go through League Admins which makes everything even more time consuming. I know RGL is working on site updates with QOL improvements for both staff and players so hopefully that will improve case work in the future.
As for getting new people in, I introduced a test case for applicants similar to the one ETF2L AC trials have to go through and many potential trials just displayed a poor understanding of cheats or jumped to conclusions way too quickly. Many of those who showed enough promise lost interest as soon as they realised how much work they would have to do and left before completing their trial period. I'm not really sure how the entire process can be improved since it generally works fine the way we do things in EU. Although we certainly have had cases in the past that sadly took longer than they should have. RGL/NA has the additional pressure that there is money involved in higher divs which doesn't help.
For RGL itself I would recommend making POV requests possible for teams similar to ETF2L and to make those uploads publicly available. The reason why I advocate for this is because it's good for report quality, otherwise NA players are limited to STVs or other type of recordings. I heard RGL is looking into implementing this so that's good.
Besides applying for AC (please only do so if you are prepared to work on many different cases in the future and not just the ones you are interested in), the best you can do is write conclusive reports on players that include evidence, demo ticks and explanations to help the AC team with their work. For the NA scene overall I hope that AC staff can become more efficient.