Yeah, I got the general sentiment of that breakdown but the idea that “The prequels are substance without excitement” doesn’t hold up to too much scrutiny. There isn’t really a lot of substance there. There COULD have been, but Lucas wasn’t interested in working his material until it coalesced. All three of his prequel scripts were messes (Attack of the Clones wasn’t even finished when they started shooting, and by “finished” I’m pretty sure that meant “second draft”)

Unformed sketches of larger ideas aren’t the same as substance. BUT: I get what that saying is going for. I think it’s more accurate to say

Original Trilogy: Fun myth
Prequel Trilogy: Boring backstory
Sequel Trilogy: Eager Remix