1- Move this topic to reputation board.
2- Either his main account is banned so he is not allowed to use it for posting, so he is also not allowed not use alts to post outside the Meta board or send pm to others. You can report those PMs to mods as spam and explain the situation so his alt will be banned as well. Or He's someone using the profile name of another account.
According to bpip, greatorchid is banned:
https://bpip.org/Profile?p=GreatOrchid3- I know that banned users are not allowed to use forum features neither services offered here, but i can't tell that the offer is shady as there is a collateral offered. It's a little bit weird how someone ready to give $2k USDT as collateral for $200 btc loan!! Better you stay away from dealing with similar cases as the user is banned and you already give free interest small loans for reputed members.
This user already has two opened ban appeal threads and maybe mods will accept unban him sooner. Until the unban take place (if any), better to forget about him.