If it's on telegram then just forget about it. If the deal has done off-forum, then nothing to do with forum users.
According to the telegram chat and the tx link OP posted, it proves that this address belongs to the said scammer- 0xdb8274bde4f5cf292f82ddaac09c791a906e3b11
The tx includes said amount; you can be sure that what OP is saying is true. OP, why didn't you include the profile link of the scammer above? You can create a flag and ask for support.