Indeed, you're right to consider it to be paradoxical, and this is one of the reasons that this justification is not really an end goal, that is: This is why the Respects Your Freedom certification will probably change when the time comes where there's a possibility to run free, and writable, software on similar hardware. Besides, I would actually edit my previous publication as to replace "acceptable" with "passable for the time being (must check later on)", since this situation doesn't qualify as a good use of non-free software for free software advancement[1].
REFERENCES [1] https://www.gnu.org/philosophy/is-ever-good-use-nonfree-program.en.html