I don't know if I would be so quick to believe what he is telling you, unless you have additional information, something isn't adding up for me.
Did the thieves make up just the reviews or the whole mascpigbTm profile. If just the reviews then they got into his phone & his rentmen acct.
Why doesn't he contact Rentmen to get the reviews removed. He could probably get the profiles removed too with his story & all your sleuthing. He would be doing the community a great service.
I also get it if he just wants to forget what happened & move on