In several swing states, and that the republican legislatures will refuse to certify the electors, but, as has been noted, it doesnt work that way in many/most states.
The CT also stipulates that Trump will declare a state of emergency due to the fraud in order for the DOJ to investigate/interfere with the SOS certification of popular vote tallies, which trigger the appointment of electors in many places, in the hopes of throwing the election to the House, where each state gets one vote.
While Trump/Barr may attempt such a strategy, I doubt it has much chance of succeeding. For one, the streets would fill with protestors who would make recent marches look like picnics, and this uncertainty would also cause the markets to crash. Trump/Barr would only have about 5weeks to interfere with the appointment of electors in the four states the CT claims would be challenged, which the CT claims would prevent either candidate from getting to 270, and throw the election to the house.
Not so fast.
The 12th amendment states:
So on January 10 (IIRC), the new Congress unseals and counts the ballots from electors who were appointed and cast their ballots on Dec. 14. The winner is whoever has a majority of electoral votes among the those votes sent to the House for certification. The only time it goes to the house is if there is a tie, or if 3 or more candidates split the electors and none have a majority. With a two way election, that is not mathematically possible (maybe thats why Kanye declared his candidacy )
Trump could block the appointment of electors in all 50 states, and the 3 from DC would then decide the election.