Wow, this is a really unexpected topic even though it makes sense for Tarantino. I have a feeling he planned this for longer than he said he has. In 2019 when OUATIH came out he said that his last film would be more "epilogue-y" and that OUATIH would be his epic. From this premise alone I can see it being maybe his smallest film. But who knows. Maybe he'll do something like Babylon, taking this movie critic thing and blowing it out with epic cinema set pieces etc. Really excited for this, and didn't expect he would do it this soon. I genuinely thought we'd see his film in 7-10 years.
On a side not, I really don't like the title though, every single Tarantino film has had swag and originality to it, when I read the title in the forum here I though it would be a low-mid budget comedy with Will Ferrell or something. Maybe it's a working title, I doubt it though.
Edit: Also, what about the mini series he wanted to do? Maybe he'll do that afterwards. Hopefully the film won't be the last thing he'll do directing wise.