You're getting downvoted a lot for some reason, but I just thought I'd say that I think this technique has potential.
It'll be fiddly to exploit (like the "undredacter" you linked), but I think you could get a text-recovery PoC going. Try to craft an "ideal scenario" (for an attacker - i.e. ideal censor-bar placement and font size), see if you can exploit it in practice, and build from there.
It'll be fiddly to exploit (like the "undredacter" you linked), but I think you could get a text-recovery PoC going. Try to craft an "ideal scenario" (for an attacker - i.e. ideal censor-bar placement and font size), see if you can exploit it in practice, and build from there.