Yes that is how it works. But not all features are available through Homekit, most notably you can’t set te state for Home/Away. That can only be set through the cloud API.

Be aware Tado just announced limiting access to the Api to 100 calls a day. Which is quite low. For full access you need a subscription for 5 euros a month. Perhaps read up on that before investing.

I clearly remember screaming a lot of “Ferengan Ha’DIbaH!” in the microphone for Star Trek: Klingon.

I thought my Pixel 2 would be perfect for a custom rom. But then I found Google locked the bootloader for refurbished phones. I couldn’t find a way around that so now it’s a paperweight.