Yes, the diligent review performed by the lowest-bidding subcontractor is an excellent defense against career-ending criminal accusations. Nothing can go wrong, this is fine.
I would think there is way easier ways to frame someone with CSAM then this. Like dump a thumbdrive of the stuff on them and report them to the police.
The police will not investigate every hint and a thumbdrive still has some plausible deniability. Evidence on your phone looks far worse and, thanks to this new process, law enforcement will receive actual evidence instead of just a hint.