A lot of that was said to be due to COVID shutdowns and wanting to get the hospitality industry going. I also think there was an incumbency bump among Hispanics but can't find the 2016 exit polls for that state.
Either way, mailing ballots out to every household in the state is going to help the democrats. A lot of republicans will probably throw their mail-in ballot in the trash with the intent of showing up in-person at the polls on election day to vote for Laxalt or whoever the GOP puts up. That is, if they don't forget.
And then the remaining, very small slice of Republicans who somehow didn’t forget about the election AND didn’t throw away their ballot will probably forget
how to vote... unless their Dear Leader sends them an instruction manual that contains his signature and spells out to them how they should fill out their ballot, they’ll probably become depressed and just give up after an hour or so because they couldn’t figure it out or just didn’t care because Trump's name isn’t on the ballot. And then we’ll get a CCM NUT map that will put even Mark Kelly's and Chris Sununu's NUT maps to shame.