Reply to old reply, sorry. Technically blocking the IP isn’t perfect either. In theory, as long as it has the wifi credentials, and your wifi has access to the internet, your TV will be able to access the internet if it really wants to. All it’d have to do is ignore the IP assignment or fake/change a MAC address during DHCP. I don’t know why a “legit” TV would do this, but if you get some unbranded Chinese thing, or if any wifi device wants to be malicious, it can bypass DHCP+IP filters very easily.