Chip intended for this thing is also heavily blobbed. Even the creator lists "Push vendors to open up their existing closed-source code and ditch binary blobs entirely." as one of the goals as if small niche gadget had any chance of erven nudging the needle.
We are talking Rockchip, company mired in numerous GPL violations with latest nuking their github repository early this year.
And yet a smartphone running an FSF-endorsed distro does exist, so it's possible: https://en.wikipedia.org/wiki/Librem_5. Not free of firmware blobs though.