In the meantime, I would be super grateful for help by an experienced person, to check the blockchain.
https://blockchair.com/bitcoin/address/1JW9NJneiHVqpvDgcNah4FLXRF62Mw1Np5I just don't get scammer vibes from him at all, even though I realise anyone could be tricked.
Some scammers are obvious, but others are experienced con artists.
His high score on Local Bitcoin Exchange also indicates he's honest.
Those accounts also get sold, or hacked.