I seriously doubt that a 3 point national victory would give Biden all of the key swing states except Georgia. The way things are looking now a 3 point national win seems unlikely to actually be enough to get to 270.
I could totally buy this. The only states decided by <1 point in 2020 were AZ, GA, and WI. And my impression is that while Georgia has shifted slightly right, Arizona and Wisconsin have shifted slightly left. Not to mention that New York and California seem likely to shift a bit right.
