You probably can use your tv without it using you, or probably not.
I, too, use pihole. But it does not prevent your data from leaking 100% and never will. And it’s easily circumvented by using other DNS servers or even by connecting to hardcoded IPs. I dont know specifically about TVs, but some manufacturers do that.
The only way to make sure that TV can never spy is to never connect it to the internet.
Probably trying to be all official and presidential and stuff.