That's really the salient point. The EC vote count trumps (see what I did there?) everything else, and you're correct, Harris winning 51% or 98% of California votes makes no difference in the EC vote count.
So Harris pulling ahead in the national polls means little or nothing if she gets that lead by banking additional votes from deep blue states, which is what it looks like.
It will be interesting the last few weeks when more state polling is available.