I think the opposite. Gege learned from the big 3 main mistake: their horrible pacing fulled with useless subplots, flashbacks, over-repetitive scenes, endless moralizing/emo dialogues about good and evil...
On the other hand Gege took the fast and furious path avoiding those inflated boring forced extensions.
To each their own, but I said I wish Gege kept it at a regular pace, his regular pace. I didn't like the last few chapters at all. I was looking forward to the bath and it was hyped for a few chapters only to be resolved within a few pages with nothing grandiose coming out of it. Sukuna appearing in front of Ryu just like that, and then a page later, Yorozu is there. I don't mind fast pace, but this is clearly rushed. We wasted an entire volume on Maki becoming Toji again, with two plot devices, whose names I don't even remember any longer, but things are rushed now and weird.
Edit: And it's weird because these are the things we want to see in detail. These are the things that are necessary. If the Heian era flashback is rushed like this, it will be a massive flop. If there is any at all lol, with how fast Gege is trying to end it.
Gege said he wants to finish this year. Let's take his word for it and even extend it a few months. Even if we give him an entire year from now, that'll be around 40 chapters. 40 chapters for the Heian era flashback, freeing Gojo, Gojo and Sukuna fighting, beating Kenjaku, potentially fighting against Sukuna again, freeing Megumi, dealing with Tengen, figuring out what it is Sukuna wants, and the aftermath. Not to mention finding out more about Kenny, Yuji's parents, Kashimo fighting Sukuna, what happens with the rest of the gang, where and what's going on with Nobara, what was the plot with Miwa wondering around in colonies, etc.
And that's with me extending it. And taking into account December as well having a regular month schedule and not those typical breaks.
If we take Gege's word and he wants to end it by the end of the year, that's somewhere from 20-30ish chapters.