I can’t confirm this personally, but I’ve seen a couple people mention that on Pablo Hidalgo’s now private Twitter, he said the latest Greedo change did come from George Lucas himself when they started work on the 4K restoration.
Grain of salt, of course, but that makes more sense than LFL/Disney deciding to arbitrarily make one more weird change without his input.
This is Pablo Hidalgo’s comments on it…
(from https://twitter.com/StarWarsVisComp/status/1194284818290401280)