That's an incredibly stupid observation by Bosa, a guy who is incredibly stupid to begin with.
The majority -- the large majority -- of NFL quarterbacks are shorter than the guys in front of them. This is offset by the fact that linemen do not stand up straight while blocking, and the fact that the entire pocket is not covered in an impenetrable layer of linemen skulls/helmets. In fact, do you know what type of guys have been the least successful quarterback draftees over the last decade or so? That's right, really tall guys, the 6'7" and 6'8" guys like Brock Osweiler, Paxton Lynch, etc. Because they're so ****ing tall that A) the entire defense can see them operating in full in the pocket, and B) simple physics dictate that a man with a longer (in terms of distance) arm will have a longer (in terms of both distance and time) release. Not by a whole lot, but at this level of competition, that 'not by a whole lot' matters a whole lot.
Just to give you an example of how stupid this is, consider Aaron Rodgers. Rodgers may be the best quarterback in the history of pro football when it comes to protecting the football. In addition to being a prolific multiple All-Pro and championship quarterback, he is historically great at avoiding interceptions. You know how tall he is? He's barely a full inch taller than Baker Mayfield. Has anyone ever said anything about Rodgers' height? Well, not in the last decade. You're going to tell me one inch of height is the difference there? When Drew Brees only clears 6' on his tiptoes and Russell Wilson doesn't even pretend that he does? Get real.
Baker Mayfield is not struggling right now because his linemen are too tall.
Nick Bosa is a stone cold moron. Runs in the family, I guess.