Imo Devs can't fix this, I am not even sure if freezing could have legal consequences, jeopardising the whole project.
I suspect it's possible to freeze it and wait for him asking for refund of the original bitcoins.
You can't be 100% sure it is his account.
If he sold this account, the new owner would have to prove he is not CH?
How would this work? This has (legal) problems written all over it.
That would be Child Harold's headache, not ours.