Hi @acidtone if that any help the old AWS NS details are shown when Hosted zone details section is expanded:
On AWS now I have two A record entries one for arcadechain.io and one for www.arcadechain.io both pointing to 75.2.60.5
After that I also created SSL certificates in AWS Certificate Manager.
In netlify I deleted DNS settings altogether and set www. as the primary domain as per Configure external DNS for a custom domain | Netlify Docs
Good luck 