This video was actually already posted in the Holding Tank, so there are some comments there as well.
I think the professor made his biggest mistake in the first 30 seconds: It doesn't matter whether a candidate concedes or not in terms of the issue needing to be solved in the House of Representatives. The only issue is whether or not there are a majority of certified electors for one or the other candidate as Creekwood describes. In 2000, Vice President Gore conceded, then took it back. In 2016, Hilary Clinton conceded but then participated in subsequent attempts to recount or otherwise challenge the election.
His likening of the situation to a monarchy was cringe-worthy.
He neglected to mention the election I think was the most relevant contested election with no concession. In the election of 1876 there were multiple state elector certs as well as accusations of voter fraud. The Congress, facing a crisis and seeing the 12th Amendment as it stood was not going to be sufficient to solve the problem, passed a quick law forming an "Electoral Commission" that ultimately decided the election through the Compromise of 1877. The Compromise ended Reconstruction in return for the election of the Republican candidate. Congress then passed the Electoral Count Act of 1887 (
https://en.wikipedia.org/wiki/Electoral_Count_Act) to supplement the 12th Amendment and it provides a great level of detail on how the vote is processed. One needs to absorb that law to understand what may happen if the current election ends up in Congress for resolution. The law includes roles for state legislatures and governors as well as U.S. Senators that are quite a bit more complicated than the professor's description of everything happening in the House. Its provisions likely make it impossible for the current controversy to succeed based on how Certifications are processed. Interestingly, it also includes the provision that could make Speaker Pelosi President under certain scenarios.
The professor also got the number of members of the House of Representatives wrong but I guess that is a nit.