The lineal heavyweight championship only exist as a public idea and who thinks Fury retains that mythical title after he relinquished his official heavyweight championships in 2016? He stalled the Klitschko rematch, did cocaine, and allegedly was doping his way out of any hold on anything.
But if you want to technically apply something that doesn't exist (the idea that the champ must be
"the man who beat the man") than you could make a case for Fury still being the lineal champ reducing this "ghost belt" from somewhat relevant to absurd.