if you run a whois on ampproject.org, the results clearly indicate it's owned by google.
Registrant ID:mmr-87489
Registrant Name:DNS Admin
Registrant Organization:Google Inc.
Registrant Street: 1600 Amphitheatre Parkway
Registrant City:Mountain View
Registrant State/Province:CA
Registrant Postal Code:94043
Registrant Country:US
Registrant Phone:+1.6502530000
Registrant Phone Ext:
Registrant Fax: +1.6502530001
Registrant Fax Ext:
Registrant Email:dns-admin@google.com
The tech lead of the project is Malte Ubl who by their twitter page : @cramforce indicates that "I make www internet web pages for Google. "
Unless it's a 20% off time project (or a side project of some kind), I can't understand why you say it's not a Google project if it's being funded by google and made by a google employee.