My experience with indexing a new website is quite different.I can confirm indexing is going totally wrong for the last couple of days especially,
This is the case for both manually created links with handwritten content as well as a new website, not even getting crawled,
Strong links still getting fast indexed as usual
Almost every time I create a brand new, legitimate, fully-functioning website on a fresh, non-expired domain, the homepage tends to get naturally indexed in just a few days. Over time, internal pages are also getting indexed once every few days.
The last one I did was just a week ago, the homepage and 1 internal page has already been indexed. I've not done any link building yet, and also not even registered the sites on search console.
However, indexing those lower quality tiered links are a different story altogether.. I also felt its much harder to get them indexed since late october (about similar timeline as OP?). I had a way higher index rate in september.