This is just information I found about Pink Flamingos, not Multiple Maniacs. but it’s the internet, so my source may be wrong. I agree with your points, 100%.

Update: I emailed criterion asking if it was the original uncut version PF and this is what they replied…

I can confirm that our upcoming release of PINK FLAMINGOS is the original, uncut version: https://www.criterion.com/films/31320-pink-flamingos. I hope this clarifies any confusion.

Please let us know if you have any other questions, and thanks for your interest in Criterion!

So it’s confirmed that it is the uncut OG version. but I don’t believe it will have that original soundtrack due to copyright issues. But that’s ok.
I wonder if they will store those original deleted scenes?
Have a great day