i don't know the name of the proposal

it just makes it so the spend address cannot be known ahead of time, it doesn't hide the amounts

I don't think there will ever be monero style hidden amount CTs because of the auditability problem, but being able to prevent attackers from knowing what address spending to monitor for is a big advance for privacy

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Oh do you mean MW (mimblewimble) then? It was added to Litecoin as an "extension block" (like a sidechain) and they call it MWEB for MimbleWimble Extension Block

In Litecoin's case they implemented it with CT so it hides amounts but it can be done just as a "mixing" protocol

Bitcoin should just add optional MWEB. A turnstile going back to the transparent side would still guarantee supply.