Laszlo79 , that's been asked more than once in the past related to Airplay. (See especially this post).
Undoubtedly, someone at Roku knows which TCL, Sharp, Onn, et. al. models are Roku model 7000, 8000, etc. But, they don't care about the customer.
That's the common theme with Roku. Customers want to buy a Roku tv. They want Airplay. They ask which tvs have Airplay. And, Roku gives the answer they're NOT looking for. Then ignores their continued questions because that's not what Roku's looking for.
It's really amazing. Roku wanted to be the Android of TVs. Today, Android is on tvs. Android doesn't have it's own firewalled version of TV models to talk about to everyone's exclusion. It's like Roku is in denial about its chances of being what now exists.
Every interaction I have with Roku is more revealing. Everything says "we don't care about customers." This topic is a perfect example. They'll talk about model numbers that mean nothing to anyone. It's like Roku's own internal language matters more than the customer.