My site has pages that that ranked organically with good content without any targeted keyword backlinks.
These pages lost ranking.
On the same site, those pages that had plenty of backlinks with targeted keywords, did not lose ranking at all.
So it's kinda "funny" that google fucked the good quality, organic results (in my case at least) while the artificially pumped results with PBN links stayed stable.
Conclusion: As I was always saying, in the past 20 years nothing changed in SEO:
YOU NEED LINKS
The quality, the length, the internal linking, etc of your content doesn't matter.
At least this latest update showed me this.