No, you can't adblock remote attestation. Trust me, the whole idea is cryptographically sound (with a proper implementation of course), people have been building out the remote attestation/TPM space for 20 years now.

Every time it's brought up (like I previously suggested that it could be used by NVIDIA/etc to disrupt mining operations from a driver level) there's people who think there is some easy runaround and if there was the whole idea would be broken from the start. The TPM provides a secure root to start the cryptographic validation from, and while you can mod the software, it will be immediately evident from the attestation, and they will simply not serve the video. Or in the case of a GPU, you can have the PC attest to the drivers being official and unmodified, and if that doesn't happen the GPU refuses to clock up the memory bus.

At best it will be an arms race between TPM developers and adblock devs.

There is also the "analog gap", but that's been notionally plugged for years using HDCP. Early implementations were quickly broken, HDCP 2.3 is still doing pretty well, and it provides a massive speedbump to people who think they're just going to plug a capture card in and loop the video through.

Netflix and others have been doing this for all the years and the tricks are well-known at this point. Netflix doesn't push too hard, but they won't serve you the highest-quality video if you don't have a secure signal path either.