Yes, that’s proof that he did it, after the fact.
They evidently didn’t see it while it was happening or they would have called the police.
I can smell a law suit in the making though. It will be that Wal-Mart should have had someone monitoring those cameras.
There was a story a few weeks ago where this woman left her baby in the car - said she parked it where the security camera was pointed at her car - explained to cops that the security people in Wal-Mart would watch her kid - turns out they did and called the cops ....