Not to put words in their mouth, but I think that’s what he’s saying:

Miles Morales is cool, because he’s his own person with their own character traits.

As opposed to rebooting Peter Parker and making him a half black, half Puerto Rican (which I think is what he is inferring when mentioning Luke Skywalker and Klingons).

Not to haters who think legacy heroes should never have successors or treat their name like some kind of precious think never to be touch by others (except for in the mainline comics, sometimes for years at a time but always reverting to the OG within 5-6 years).

Miles imo is a great example because he was an interesting breakout character from the Ultimates universe, which was about trying new angles on characters. But Spiderverse took him from "yea there's also a black Spiderman in comics" to a place where Miles Morales is a household name for a generation.

This robs the original Spider-Man of nothing. Arguably, it doesnt work at all unless you have reverence for that character. But people haaaaated Miles in certain circles of the internet. Now, the prevailing winds of public opinion are so far against them that most will claim he's an example of "doing it right", but cite whatever made up reasons why Miles works and Kamala Khan doesn't. Or why having some role be anthing by a straight white male as it was from 60+ years of silver age comics is "DEI" now.