Use of a PC secure deletion tool being a "red flag": That would be an old policeman's attitude
I work for the bad guys' defence teams. Drug dealers, paedophiles etc. If I see a deletion tool in use I know they are up to no good.
I'm definitely no cop nor have I ever been. I just know what's normal and not normal.
Getting on topic. If a deletion tool has been used then there are very grave suspicions about the user. Let's wait and see what is revealed in subsequent investigations.