@bi4smooth I very much like your chronological staging of these events. If one takes my view that one lies if and only if one "knows" that what is being said is false (which is not the only way of defining lying), then indeed it would seem that Mr Trump would not have been lying on November 3 or 10, as there was still some (shrinking) ambiguity about the actual election result. By late November, it would be difficult for a rational person to not believe that Mr Biden had won, so assertions by Mr Trump of victory at that point are close to being lies.
But applying the analysis here needs to assume that Mr Trump is being rational. It's possible that he actually believes, even today, that we won the election, even though state and federal government processes have declared and finalised otherwise. If he does actually believe the (irrational and untrue) proposition that he won the election, then by my narrow definition of lying, it wouldn't be a lie for him to say "I won the election." But if he were to say, "I know that I won the election," then that would be a lie, because to "know" that he won means he has justification for believing that--and clearly there is none. Perhaps I'm stretching the analytical framework beyond where it works. It's not easy to apply rational categories to someone as "unique" as Mr Trump.