Not true depending on the article of clothing and the guy's proportions.
Someone 5'11" with proportions will generally have a moto/dr sleeve of around 24.5".
I have never seen a human being with such tiny shoulders for that chest size. Just trying to imagine your body in my head, frankly, terrifies me.

Took my measurements in hopes of buying that 2013 TOJ0, but my measurements are all over the place..
Which size do you think is best?
My body measurements (in inches):
Shoulders: 19.5
Chest: 42.5, pit to pit: 21
Midsection: 33
Waist: 32
Sleeve Length: 24.5
Bicep: 16.5
Charly recommended a 50, I'm a little hesitant because I dont wanna order and be stuck with a jacket that is too small.
I'm also 5'9'' 175lbs, athletic slim build.
I am now leaning towards a 52 (with reductions in the lengths).. do these jackets run big or small? And is the sizing slim fit? or is this brand more relaxed/loose?