Whole quote: “the billing and support services for Google Workspace (including G Suite) subscriptions currently billed by Google Domains will be managed by Squarespace”
This is only if you registered your domain and signed up for Google Workspace separately. If you registered your domain during the Google Workspace onboarding process billing and management for your domain will be through Squarespace but billing for Google Workspace will continue to be through Google.
I went thru some nonsense trying to get two 50 user accounts past 50 users (it required Google elevating the support request and 24 hour delays) until I noticed there were more than one way to register workspace accounts - the dual of this? I documented the process and strategically kept it from biological storage.
I will probably be forced to revisit those notes soon.