I had a similar situation where I bought a domain for an old blogger blog years ago.
So anyway the credit card tied to that has expired (years ago I thought).
Then Google emails me their "update your payment information" email ... and points me to a Gsuite login.
Bro (Google) I don't have a Gsuite account ... and my regular Google account has valid payment options. Every form of help just points back to Gsuite...
Blogger doesn't appear to have any of the old information as far as the domain being purchased.
I managed to get the domain registrar to help. There was no way to contact Google, it was just an infinite loop telling me to login to Gsuite.