You got that right—this is a bullshit back door. That's my favourite kind of back door. Because it does one thing incredibly well: it starves of oxygen the one remotely tractable argument politicians have found to break real E2E encryption with real, non-bullshit back doors.
With this technology in place, never again will the Government be able to wail "think of the children" when claiming E2E needs a back door in order to protect the the children.