Absolutely. 2016 showed them how to cheat to win. But the most basic thing remains true. If the left gets out to vote, they win. This pandemic going on long term is actually to Trump's benefit. If it largely goes way by summer, and allows the US to have a relatively normal campaign, he's in trouble. Because his handling of it becomes a huge election issue. Economy becomes a huge election issue. Unemployment etc.
And if the Dems dont screw it up (and you can never discount that very real possibility) and come together, you have Biden with Obama, Warren, Clintons, Bernie and everyone else out campaigning and pulling everyone together for the common good. It *should* be a landslide.
Trump will say "if was so close, you have to assume they cheated." or "I was beat so badly you have to assume it's unrealistic so they must have cheated".