There are so many people who are getting shunned by JW relatives. By all accounts, the in-laws have been quite lenient towards them per JW rules. They even allowed him to build an apostate studio underneath their living quarters!
Most would be disfellowshipped for this - many aren't allowed to speak to relatives that don't even live with them. So either the WTS cares so little about him that they don't bother to keep track of what he's doing (which I think is most likely) or they like what he was doing and wouldn't want to risk preventing it (a bit far-fetched)