Correct, he doesn’t have to win it to get the Dem Nomination.
He does have to win IA, WI, MN, MI, PA, NH, and NC in 2020.
He might win two of those States
No democrat, let alone Biden will win ANY of those listed states in the General election.
Trump will take every state in 2020 he won in 16.
He will win most, if not all states he got over 45% of the vote in but lost in 2016
and he will take the fight to states where he got between 40 and 45% fo the vote in 16, and don’t be surprised if he wins a few of these as well.
Short of a complete economic meltdown or some other major black swan event, there is no path to the white house for any democrat.
Best case scenario is about 15 states and DC... and the more whackadoo their candidate winds up being, they may not even get double digits plus DC.