Cannot remove apple border router!

Hello all.
When I startet home assistant I installed my Apple TV as a border router. Soon I noticed that I cannot update matter devices using the Apple TV border router so I bought a SLZB-06MU which I connected to HA OTBR. Now I want to remove the apple border router - both are in my favorite network.

But I just can’t remove the Apple TV. I unplugged the Apple TV, removed all the credentials, removed and reinstalled Matter and Thread in HA, but still - when I restart the Apple TV it gets automatically reinstalled in Thread.

Can someone help me solving my problem?

Thank you very much and best regards,
Martin