That’s like a losing football team saying that they actually won because they gained more offensive yards. Or a losing basketball team saying that they should have won because they grabbed more rebounds. If those were the metrics that determined who won, everyone would have played the game differently.
I’m not trying to say that Donald Trump would have won the popular vote. My point is that we don’t know who would have won that contest because everything would have changed. Had popular vote been the measure, Republicans would have shifted their war machinery to the large population blue states that they let go uncontested. They would have swarmed the suburbs with field offices and volunteers and saturated the airwaves with ads.
So for Democrats to say that Hillary would have won the presidency because she had a popular vote lead is pure propaganda. It’s possible that Donald Trump would have won by an even larger margin.