That's probably the idea. Spread confusion, make it more difficult for others to vote, create the impression of voting fraud. Ignore those pesky laws.
Why not just vote in person if you're going to show up anyway to check if mail voting worked?
It's looking more and more like Trump's October surprise will be a vaccine announcement, except with early voting they're starting to roll that out early, especially since the promise of a vaccine needs some time to take hold rather than just being a last week announcement.
It's likely BS, and any vaccine will start off small scale anyway. But much better than bombing Iran, armed militia at polling stations, or some else militia/military related. Or indictments of your foes.