Don't be fooled that it won't work. It works in China and they have math there too.
The only thing China will succeed in is extending the gerontocracy for a little bit longer. But eventually the cost of strongly encrypted communications will drop to zero and then the information advantage that the government has is over.
Think 'Starlink' + a couple of rounds of tech improvement and the GFOC might as well not exist. The question is will the people care? In China, I'm not so sure. In the West, maybe they will, maybe they won't, but I for one will be happy to utterly ignore this if it ever makes it into law. Right now I don't bother encrypting my mail, but if this happens I might drop off the grid entirely, and I'll make it my mission to spread strong crypto as far and as wide as I can.
But for now it's just a misguided proposal by a clueless bunch of bureaucrats.