Transfer domain from old netlify account I no longer have access to

Yes.

Follow these instructions:
https://answers.netlify.com/t/support-guide-verifying-domain-ownership-for-netlify-custom-domain/13765

The value that you would use is:

https://answers.netlify.com/t/transfer-domain-from-old-netlify-account-i-no-longer-have-access-to/136460

Once the record has been added let Netlify know by posting here again.
Their staff will then do the removal.

(Note: I can’t advise how long it will take, I don’t work for them.)