Actual papers are as good as ever. This is just trying to stop the flood of autogenated slop, if anything because arXiv hosting space is not free.
What’s the new method?
For example: https://prereview.org/en-us
Anecdotally, a lot of researchers will run their paper pdfs through an AI iteration or two during drafting which also (kinda but not really) counts as a self-review. Although that is not comparable to peer review ofc.