They make perfect sense. Reg Park was 6 ft 1 in his prime and weighed 225 - 235 lbs in contest shape. About 250 lbs off season. Similar build as Arnold had in his prime.
Thanks to different and more drugs in the 1990s bodybuilders increased their muscles and weight. Bigger and bloated guts too, and way bigger legs and glute muscles.
Berry de Mey's contest weight in the late 1980s often was 225 - 235 lbs, and he is 6 ft tall

Note: none of the bodybuilders of the 1990s and later trained harder than Arnold. They just used growth hormones / more and different gear.
Oh come on. Do you even lift? You obviously have no idea what a 57" chest looks like. The largest mass monsters, who weighed 50-100+ pounds more than Arnold at
lower listed heights, might have had chests around 57". Like peak Dexter Jackson, de May probably isn't breaking 50".
De May's arms are also recorded at 19.5".
A 22" muscular arm is, again, mass monster territory -- not something that you'd ever expect to see on a guy like Arnold with totally flat and stringy triceps.
Off-season Phil Heath,
with a pump, is at 23", and in contest shape he's probably around 22". This is at ~270 pounds and 5'9", in a bodybuilder famous for his arms.
Roelly is also around 23" with a pump in the offseason, at around
280 pounds:
Ronne here in 2004 was at 21.5", closer to contest shape:
Ronnie's chest was also . . . 57".
B-but they have way bigger legs and glute muscles!!
Arnold claims 28" thighs. (lol!) Jay Cutler, much shorter and heavier, is listed at 30". No matter what his actual height, Arnold in his bodybuilding days was clearly much taller. If we take him at his word, he has as much leg muscle as Jay Cutler.
Tom Platz also had 28" thighs at 5'9" and 230 pounds:
https://bretcontreras.com/best-legs-in-bodybuilding-history/#comment-11270Those Arnold measurements are
100% bullshit: It's
physically impossible for those measurements, height, and weight to be correct. It's all lies.
Unless you believe that Arnold's muscles somehow have a lower density than regular human muscles, you have to realize that you've been lied to. And if he's lying about his arm measurement (obviously) then what else is he lying about?