100% agree, nothing in his work or interviews actually lead me to believe that he's been doing anything other than just moving forward one step at a time, retconning as needed without much more of a plan then "milk it for all it's worth"
I don't believe for a second that the brief mention of "clone wars" in IV meant he already had the prequels drafted or even more than a vague idea about what the clone wars mightve been, to give an example. There are countless similar throwaway lines in his movies that are total nonsense (looking at you, Kessel Run in 14 parsecs...), there's no reason to think there was more going on with the bits that eventually got retconned into existence
It literally has all the federation features removed. By definition it isn't part of the fediverse, because it's not federating anything
If I set up my own mastodon server, but blocked literally all federation, then my server wouldn't be part of the fediverse. It's a bit odd that this has to be elaborated on