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Oh yeah it hasn't been added to the constitution yet despite it being a thing proposed in the 1970's. There's a chance our next president here is going to undo one of the meager concessions obtained by the civil rights movement and spit on it's legacy
Edit: Pls join protests and stuff, there was a march last week to try and pressure him into getting it included in the constitution but it's been basically erased from media
Normally, yes, but there are specific measures Biden could have done (obviously with the compliance of individuals in his party and administration).
Biden could have, at any time, directed the archivist to certify it, making an official statement that his DOJ believes states cannot rescind ratifications, if he wanted.
Earlier, when Democrats had control of both houses of Congress in the 117th (instead of waiting until they lost the House), his administration could have followed in the steps of the very belatedly ratified 27th Amendment and also made it a policy point to ask Congress to pass concurrent resolutions declaring that the amendment was validly ratified.