Tbf some of the best CBs of the past have been short, so I'm not sure one more excellent short CB changes that narrative.
What was more specific to Martinez is the idea that you can't have that short a CB in the Premier League. If it changes the perception around anything it should be the exaggerated notion of just how uniquely physical the PL is and how that physicality manifests itself.
Because some people seemed to be imagining the PL as a brutish, direct league filled with giants who would bully a shorter CB in a way they've never encountered before. When in reality there are few if any old-school
stereotypically "English" style teams in the league any more. A league like La Liga has statistically played more long-ball football in recent seasons, players in the PL are shorter on average than even the league Martinez just came from and insofar as the PL is any more physical than other leagues it's in terms of the pace and intensity of the game rather that pure strength. Bernardo Silva style running machines are what the PL demands, not size.