The waiting time for getting indexed can be over a month. So your waiting time of 4 days seems kinda small in comparison. I do not know the current estimate. Just read similar threads.
I do not know what Itch staff is doing or not doing. But they take several weeks to remove reported malware and I think that would be more important than indexing new games. R-112156 R-111516 R-111520 R-111522 are from Februrary and still indexed. There are more.
I feel like Itch directs my reports into the spam folder. I have no plausible explanation why an important thing like that takes so long or is ignored. Maybe the ddos attacks are to flood their system, so things like that do not get worked on.