Democrats and their never-Trumper allies produced similar scenarios to partition the US in the event of Trump victory in 2020. Here is one involving the secession of California, Oregon and Washington.
. . . The Biden Campaign encouraged Western states, particularly California but also Oregon and Washington, and collectively known as “Cascadia,” to secede from the Union unless Congressional Republicans agreed to a set of structural reforms to fix our democratic system to ensure majority rule. . .This partisan division remained unresolved because neither side backed down, and January 20 arrived without a single president-elect entitled to be Commander-in-Chief after noon that day. It was unclear what the military would do in this situation.
Democrats' war games for contesting the election
https://paxsims.files.wordpress.com/2020/08/preventing-a-disrupted-presidential-election-and-transition-8-3-20.pdf
The FBI would have locked up everyone from the conference on charges of seditious conspiracy if a group of Trump supporters had come up with a similar scenario. Has anyone ever questioned Biden about the plots by his supporters?