> if at some point they request you to provide the code they sent to the phone you don't have for the last 10 years

AFAIK once 2FA is up, you can remove your phone number from GMail.

I know it takes time to set up a recovery account (in case the account is inactive for x months), to remove a phone number, etc. but if one's GMail is important it could be worth doing both now if it hasn't already been done.