But this is part of the democratic process. If the presidential candidate died a week before election and the VP took his place, we would not be discussing the situation as undemocratic.

When I say democratic, I don't mean the Democratic party's primary process, I mean a process by which people vote to select a leader.

Yes I agree that Joe Biden had the legal authority to step down and appoint Kamala Harris as his successor to run for President. No, I don't think doing that is democratic. What would have followed the democratic process would have been recognize what everyone else knew way in advance and stepping down early enough for potential nominees to run to be the candidate.