Unpairing Apple Watch 3 from Afar ? Can it be done through iCloud ?

I sold my Apple Watch 3 to someone out of state. I unpaired the device and performed a factory reset before sending. He received the watch and it apparently is prompting him to input my credentials. I logged into iCloud and it still shows my watch under my account there but not on my phone. I read that by clicking 'erase apple watch' will solve this problem. I did and it still states that 'erase is pending' and is needed to connect to the internet. He claims that he performed an update and it keeps asking for my credentials. What can I do from afar to remove my Apple ID <so called> restriction ? Should I click on 'remove from account' when logged into iCloud on my desktop ?

The current image of what he's looking at is attached. Thanks for the help.