"I would like to request, however, that developers not use the UltraHLE name..."
It was a request, he didn't say that he demands it. Yes later on he says that he owns copyright to the name and what not (not like it matters unless he legally owns it). But he didn't come out like a total jerk and demand anything.
But to stay on topic, I also don't see any reason to change, because if he just wants recognition for the original source (as he requested to be mentioned), then keeping the original name is a great way to say "Look we didn't just come up with all of this on our own." IMHO