His neighbour was supposed to be doing it but dropped the ball somehow and he ended up buying his own rollers to do it. That’s a good point. I kind of assume everyone has seen the video which is a dumb assumption.
When the seat post isn’t pointed at the bb aren’t you changing effective angle and therefore handling by raising and lowering your saddle?
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yes- see also: any modern full squish. most will be within a not-too-zany range of saddle heights, and in theory the framebuildeur will account for that. but i have no clue how much of that you can make up with saddle fore/aft or setback posts. though i’d reckon it’s more of an impact on fit than handling, per se
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does saddle height and STA really affect handling perceptibly beyond the stack/reach type relationship of the rider to the BB?
Are you asking me to defend a position I posted at three o’clock in the morning?
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Usually custom frames are designed around a specific saddle height so STA is an imaginary line in this case that yea does move as you move the saddle but how much do you move your saddle?
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the dither waits for no man
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you can either dither or be dithered, 
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if you’re not ditherin you’re witherin
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does it count as short chainstays if you have to mount the bb on the down tube to make it happen?
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Climbs
From what I remember he was trying to maximize frame bag capacity by pushing the tubes out. The effective STA to the saddle clamp might be normal-ish, especially since the suspension post will move the saddle back as it loads. He also might tolerate the steep STA since he can support his upper body on the aero bar forearm pads.
that’s not STA as much as saddle position relative to BB
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