A really bad game of telephone. There were some studies in the eighties that were done in Phoenix. I had a biz partner who dated a deaf lady for several years and learned to sign. High accuracy signer to signer in person. From spoken to sign not too bad if signer can see speaker (lottsa lip reading). A deaf person seeing only the signer and not the speaker, signing to someone converting back to txt and you might as well be communicating in hieroglyphs. It's not at all like translating from language to language. I doubt there are any deaf people watching the lady sign when Biden is muttering. Any who are interested have voice to txt subtitles.