@thomaslowrens I take steroids (currently, 500 mg test weekly) and am 6'1 205 lbs atm. I'll say confidently, all (not some), all of them take gear. It helps a massive amount in building both strength and size. Calisthenics is much easier (especially any advanced move) at lighter weights but thats not conducive to being tall - you'd be really skinny/lanky if you naturally dieted to basically have abs/being light. You sometimes see it with pro athletes but they also have fully coordinated and moderated lifestyles between trainers, cooks and dieticians. Also, the bulk of these likely have gymnastics backgrounds as kids so learned/maintained moved growing up. You also have to be disproportionately stronger as you get taller to do certain moves.
As far as me, I can do muscle ups, handstands and to an extent back levers (maybe like 10 seconds tops, really like 5 lol). I do think if your tall you can definitely learn BW movements but as i said, u have to disproportionately stronger as u get taller while having limited bf. if you dont have years of practice - its hard. honestly, speaking i think getting good at this while making meaningful progression both skill wise and physique wise is hard af without gear. it is more doable the leaner u are but that's not a good look the taller u get. i know for sure some do it but just trying to be honest.
Just my two cents. I know I'm going to get downvotes and a bunch of anecdotal stories telling me otherwise and how I'm an idiot.
That being said, these guys are legit motivation and great write up.