So BTT mods deleted every single post which he created on BTT in his old account??? or he deleled all of his posts to hide something?. that's a red flag. hopefully a BTT mod can answer this question.
Under certain conditions, a mod can "nuke" a user, i.e. delete all posts + ban the user.
BPIP confirm that :
https://bpip.org/profile.aspx?p=BardotBonita, we can see that he has been nuked: 4/26/2019 3:48:14 AM Changed to Archived status
Nuke user