USDT TRC has become the scammer's choice for acquiring loans that are then not repaid.

According to this page the lender hasn't used that medium for their transactions before.

Requesting signed messages is also pointless on two fronts given they haven't used a bitcoin wallet address (based on the above link) even though they have an address posted on their profile page.

Plus, as you are no doubt aware the sale of UID's usually comes with an address and or email, so the request is moot.