I am not sure if there might be backlash or confusion..
You can just leave neutral feedback in both directions: "
LoyceMobile is my alt, don't deal with it, I use it on untrusted devices/locations. To reach me, talk to LoyceV only.". That confirms it's not just an imposter.
might not always be me posting from it (even though I have authorized all the posts therein)...
Tricky: they'd better not break plagiarism rules, or you risk taking the fall.