No offense for this, but does Jon Jones is deserved to become top 1 P4P in men's UFC? he was at 10th position and only fight once time with the best fighter in heavyweight, now he's beat Makhachev which previously have beat Volkanovski. From my personal opinion, Makhachev should be on top 1, Volkanovski top 2 and then followed with Jones to be in top 3.
I have no idea how they calculate these rankings but I think it is website basis as they are prone to biased speculations after the hype on Jones winning the fight.
I disagree with it, there must be another platform that won't look at the "one fight rank 1" idea. It is not strong proof yet.