Disclaimer: I voted for HRC, and loathe the elections outcome.
“women and people of color” are literally the majority contribution to the election outcome. That’s not a contortion of math, it’s a factual statement.
What is open for debate is, amongst many other things, weather or not that’s an appropriate demographic “clumping” to make. I think it’s an interesting breakout, and certainly don’t view it as an “attack”.
The author’s point, which you amongst most people in the comments seem to have missed, is that there’s a narrative that tends to demonize the Trump voter as an out of touch racist male hillbilly. His response: the demographics don’t support that.