Ball python has decided he'd rather be a tree python

[Spoons]

I think I read about how when they looked at ball pythons in the wild, males were waaaaay more likely to be prey on birds and hunt in trees, whereas females were more likely to feed on mammals and do their hunting on the ground. A climbing ball python is normal, most of them just get too big to comfortably climb AFAIK.

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This is true. In the wild ball pythons climb WAY more often than most people expect, and a decent portion of their diet is actually birds. They are found in trees fairly regularly. Both males AND females, but males more than females. Sometimes they just like to climb - my young female does, but my male shows no interest.

IF your husbandry is on point, temperatures are fine, snake isn't hungry, etc and he is still climbing, he probably just is exploring and is a climber