You are missing the point mate. Look at the distortion even in that shot and yes even the doorways are slanted (and if you cropped the photo you could see it clearly) ... from a normal standing perspective and shot face on. The height of the subject isn't the main issue .. it's the camera sensor's position relative to the subject (angle and height).The principle applies, but the magnitude of the effect is not comparable because the camera is not on top of his head and he is not 200ft tall. For example, this building is tall, it's sides are slanted. Fine. Firmino is short, the same height as the doorways at the base of the building, which are not slanted.
Look back again at the shot I posted of the incident, the camera is in the stands (and the shot cropped of course) and the top half of their bodies are clearly larger and not in proportion to their legs, that's perspective distortion and even in that shot it's obvious.
BTW even a small degree of perspective distortion makes a huge difference, my Tilt lens corrects up to 10 degrees but usually only 4-6 degrees are necessary to correct a building such as the one you've shown. Though that again will depend on your perspective relative to the subject.
Anyway I'm not going to debate this with you because it's pointless. Perspective distortion is a known & very obvious photographic phenomena that we go to great lengths to try to correct (either in camera - via a tilt/shift lens, or using distortion controls in post processing - such as with PS, LR or I use ON1 and Luminar) and if you refuse to accept the science what more can I say 😀
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