Well that would be the case in this example, so in absence of a legitimate vote count, I don't see how the EC could do anything at all but sit on their hands. So you are technically incorrect on that one. You are correct however that the sitting president would be required to vacate the office, Piezoe's reference points that out too. We would get an "acting" president. In 2020 it surely wouldn't be DJT.
The Constitution does not mandate that Electors are chose by popular vote. This is up to the states and the state legislature would send who they want. The Electoral College would not sit on their hands. If a state didn't send Electors, the College would meet and vote anyway. If no one got 270, it would go to the House.
The Electors that the state legislature selected would be sent to The Electoral College meeting to vote.
I fully agree you posts leave me as dismayed as you. Of course you do realize, since you are an expert in these matters, that there is Florida law stating how electors will be chosen. And that law applies in Florida. How does your state do it; just appoint them by spinning a bottle, I suppose. Why not, since as we know the Constitution leaves the matter of choosing electors up to the State legislatures. I suspect your real goal here is not to impress me with your encyclopedic knowledge, but rather to get me to call you a "horse's ass". Well, give up now, because I am not going to do it! You might as well pack it in.
The issue of electors came during the November 8, 2016 elections when they were about to confirm Donald Trump as the Republican nominee. Electors are appointed to represent the votes of their state. I do not know if anyone recalls the efforts of Never Trumpers to pressure the electors to go against the result of the primary votes in their respective states. While, the electors can go against the result of the actual votes cast in their state, most have the guts to stand by the voter's will! I think there was one case of an elector who voted against Donald Trump. There are consequences to electors trying to overturn the will of the voters. Do not remember what happened to that elector.