Deontay Wilder's Fiancee Calls BS On Tyson Fury's COVID Diagnosis

Deontay Wilder's fiancée, Telli Swift, is calling Tyson Fury's COVID diagnosis straight up BS ... telling TMZ Sports the boxer's tryna buy time -- 'cause he ain't ready to go toe-to-toe with her man, the Bronze Bomber! The Fury-Wilder trilogy…