It looks like if you change the name servers for an AWS registered domain you need to do it in the "Registered Domains" section rather than changing the DNS records in "Hosted Zones."
AWS: Nick - I'll be very brief, look, the lengths go through to you direct via Admin, not via us. Read the orange handbook, love. https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/domain-name-servers-glue-records.html
Well that's been my morning so far and it isn't even eight yet. How are things with you?
The change was from
.. in case I need to switch it back.