With all the polling of a Trump/Clinton race, I do think these actual, huge numbers of Trump primary votes are being overlooked.
The total primary vote totals are interesting, but not really important because in the last 40 years every primary was well over by now. New York primary voting has always been basically nothing because the race was over and there was no reason to vote. Same with all the states voting around now.
The last time there was a fight all the way to the convention was 40 years ago and back then the population of the US was much smaller, and there were much fewer primaries.
So, it’s an interesting stat, but doesn’t really mean a whole lot other than people are more likely to vote if there’s an actual race to vote on.