IMO the most egregious reason is the July 2025 memo from DOJ/FBI saying there was nobody else to investigate, after months of public interest and official statements they were working on it. If they now flop back to claiming they can’t release because of investigations, then that’s unequivocally a false reason.
I suspect it's been the false reason the whole time.
No one is investigating anything, only wiping hard drives and tying up loose ends