If Parker beats Usyk is he automatically an all time great

Whilst I understand that beating an undefeated GOAT who unlike all the other GOATs has never been dropped, let alone stopped or knocked out, and who won all his fights in his opponent's backyards on a deck stacked against him or on the road, often as the B-side, with zero deck stacking, trying to weaken or cripple his opponents at the negotiating table, and use of dirty, illegal or cowardly tactics and up at HW when already in his mid to late 30s and past his prime, so much so he is the oldest ever undisputed HW champion, 2nd oldest unified one, and the 5th oldest HW champion

Whilst I completely understand all of that, Usyk will be 39 y/o by the next time he fights so if hypothetically he were to lose no one will ever be able to claim to have beaten a prime version of him. His last loss was 16 years ago and it really should be 17 because he was robbed in both his final 2 losses