what ???
Haven’t you heard of a candidate being “on the ballot” for a given State?
See, for example:
https://newsone.com/playlist/states-actually-letting-kanye-west-appear-on-ballot/item/11
Since ballots for every State have already been determined and printed, any “replacements” for Biden/Harris will not be on the ballot (without a lot of fast maneuvering, if possible). Those wishing to vote for the “replacements” would have to write them in!!!!