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I also
don't understand why the mod hasn't banned that user since the report was made. I just think the available evidence might still make it difficult for mods to make a decision and they want to follow it up on a case by case basis.
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I am in the same side in that issue: I suggested that accounts could be frozen, but it seems that the evidences are not enough to such an operation. I guess it must be in that way to avoid some kind of teasing and interference (making wrong accusations against someone).
Anyway, there could be some phase in the investigation, where the evidences are enough to freeze the account (partially), though the final result/decision is not yet made. Ofc, depending on the tech capabilities of the BTT databases (rollback etc), the freezing may be needless.