With all due respect, Cleo has a lot of evidence, and her story is very long and detailed which makes it pretty unlikely that it's false. And who knows, if she has tried to defame him it could be because of her experience with him, but she was too scared or confused to come out (which is common). Regardless, Sentinels and Riot have both launched investigations, so in the case that it is false, then they should let Sinatraa back on, but if they let him on now it is so invalidating all victims of sexual assault with trauma, that depending on the person could have severely affected their lives, and sends a message that it is okay to do this type of stuff to other people, which is terrible.