Finally read the OP and it was both very informative and hella scary.
One thing the article only briefly touched on was what Dems can do to fight back. I would never want to see Dems involved in spreading misinformation or suppressing anyone's right to vote, but I do think there's a GOP tactic worth copying:
In the final days of the 2016 race, for example, Trump’s team tried to suppress turnout among black voters in Florida by slipping ads into their News Feeds that read, “Hillary Thinks African-Americans Are Super Predators.” An unnamed campaign official boasted to Bloomberg Businessweek that it was one of “three major voter suppression operations underway.” (The other two targeted young women and white liberals.)
If were a liberal billionaire, I would set up a SuperPAC and spend gobs of money on hyper-targeted digital campaigns aimed at suppressing
enthusiasm among key elements of Trump's base. Give all kinds of messages to evangelicals about what a horrible person he is, how he's admitted never asking God for forgiveness, etc.. Remind veterans of how he treated John McCain, La David Johnson and Humayan Khan, pardoned war criminals, etc. The point isn't to win those people over the Democratic side -- though if it happens, great -- it's to make them a little less excited about volunteering for him, talking him up to their friends, and ultimately, voting for him. I would keep the whole thing under the radar (maybe that is the case and the campaign is already happening, in which case, bravo!) and focus on simple, direct messages delivered by members of that group.
The 2018 elections demonstrated that there is a highly energized anti-Trump constituency out there, but also that there is a big pro-Trump one. That was what allowed Republicans to defeat Democratic incumbents in red states like MO, IN and ND. We have a family friend who ran against a GOP incumbent in a reddish-purple district in Florida. She told me her campaign exceeded all the voter targets of the last Democrat to win the seat, in 2014. But the incumbent still beat her by 8 points.
Point being, Trump is going to be coming hard after our base voters. We need to be prepared to return the favor.