Yes, the author completely misses the core issue: when the populace at large gets tired of getting hammered with elitist & special-interest issues, to the point of being told to actively facilitate what is broadly considered distasteful, they start looking for someone who will restore the mundane norms they are comfortable with.

The following is a list of US populist complaints, which Trump successfully addressed. (Don't up/down-vote based on whether you agree or not with the issues of the list, which I may or may not, just note that the points are important to enough people to vote a Trump into office.) In no particular order...

Facilitation/celebration of LGBQT (most people aren't, and find differing sexualities repulsive). Demands for "safe spaces" while eliminating the only long socially established safe spaces: sexually segregated restrooms. Taking taxpayer earnings and spending them on advocacy of opposing views. Reducing a sense of safety vs crime, while seemingly protecting criminals (this issue dominated by the US "gun culture"). Laying blame/responsibility for environmental issues on those thinking themselves not guilty (say, global warming). Stifling parental preferences in education (Common Core, lack of school vouchers, absolute intolerance of anything hinting of Christianity). Broad/unrelenting accusations of whites & males as invariably & irredeemably sexist/misogynist/xenophobic/racist/etc (say, Hillary's declaration of 1/4 of Americans as "deplorables"). Incredible growth of national debt ($10,000,000,000,000 in last 8 years, doubling all previous debt) with prospect of populace having to pay it. Lack of jobs (need for jobs has far outstripped creation of jobs). Overwhelming regulations, making compliance & cost untenable. Abortion being considered, on the whole, inexcusable murder of children.

Understand that classic US culture is deeply rooted in individual liberty & rights. Basically, taking someone's money to make them pay for something they don't want angers them; they'll put up with a lot, but once "enough!" hits they're prone to taking dramatic steps to end the offense. Also note that the USA is huge, having a broad range of views from coast to coast; what Hillary offered was "coastal" culture, while Trump appealed to "heartland", and with the Electoral College deliberately biasing Presidential elections toward populist views, the large number of central states won the vote.