I mean, after reading the post, I'm still struggling to find out why he thinks the statement of 'Trump losing the popular vote makes the results invalid' is invalid.
If you think of politics as a game - which for better or worse, it pretty much is - the game that was played was "win a majority of
electoral votes", and this game is (likely) played differently to the game where the goal is "win a majority of
popular votes". In the former, the focus is on winning a set of valuable battleground states; in the latter the focus would be on getting out your vote in the most populous areas. Since the games are different, you can't definitively use a result from one to conclude a result in the other.
Silly example but it'd be like in chess, if after you've been checkmated, you declare "but I had more rooks than you at the end - so really I won!". You can't change the rules of the game after it's been played...........
What I would say though is, whilst Trump losing the popular vote doesn't invalidate the result, since it's such a rare occurance, it does suggest that his victory really wasn't that emphatic.
I still can't fathom out why the Electoral College wasn't abolished in favour of a 'popular vote' system, or, perhaps even better, abolish the 'winner-takes-all' system and allocate electors of each state proportionally according to the percentage of votes received by each candidate.
I know very little about it but as far as I understand it the electoral college is very much undemocratic, but that this was intentional, there can be good reasons for doing so, and there are some who think that more democracy should not be automatically seen as a
better democracy. Here's an
article I like which touches on this (the first half, the second half is less relevant), as well as the concept of electors having the freedom to act faithlessly, which the article argues follows similar principles. I do find it interesting that some here and many elsewhere who have championed the electoral college (coincidentally favourable to Trump), were also against the idea of faithless electors (coincidentally not favourable to Trump)..............funny that.