Yes. It's about not having anything like Intel's ME running code you can't audit or control that has full access to your hardware. It's basically the same pitch as for Libreboot https://libreboot.org/.
Yes, it's a DRM-free pitch. I suppose “Keep your … proprietary code safe” could seem DRM-related but “full owner control” is an FSF-y anti-DRM catchphrase.
There's a blurb at the bottom of the Talos machine's page (same page, hit the link on the bottom left) about how they can't divulge certain details of the PCIe system.
Plenty of room for backdoors and other shenanigans in there. Which kind of undermines the entire claim...