It seems deliberately confusing to me since there is no fundamental difference between voting now and voting on the day of the deadline, but the way it’s discussed and referred to seems to imply that the correct day to vote would be waiting until the last minute instead of voting just getting it out of the way weeks ahead of time.
Election Day is traditionally the day to vote, campaigns are still running before that point. Anyone who votes earlier does so with less information than later voters. Trump could say something stupid between now and Election Day, and wouldn’t you feel bad if you’d already voted for him and couldn’t take it back?