All I know is the Trump coalition is going to need to expand, otherwise it is going to have a lot of trouble winning in the future. Non college graduate white people is a pretty bad coalition for the House / President (not as bad for the Senate). Hillary would have only won the popular vote by 1.3% in 2012 if the demographics voted the same way they did in 2016. Literally every state is becoming better for the democrats demographically besides South Carolina (and Washington DC). Idaho and New Hampshire are barely changing, though.
Even the rust belt states are becoming more demographically friendly towards Democrats, and especially the sun belt is rapidly becoming more demographically friendly.
Also you can easily get 12-15% of african americans by just not being assholes to them. Most republicans in 2016 got around that amount of AA's, just Trump underperformed them.
The Trump coalition still included the majority of white college graduates, and their objections to Trump were more related to his personality than his policies, meaning that a Trump republican without scandals like Access Hollywood could outperform him.
Trump also did better with black voters than McCain and Romney. Admittedly, he wasn't against Obama, but his results were perfectly normal for a republican. Black don't vote democrat "because republicans are assholes to them." They vote democrat because they overwhelmingly support democrat big government policies. The black vote didn't flip due to Nixon's southern strategy. It flipped decades earlier due to FDR's New Deal programs. Most blacks support welfare, want more gun control, do not consider hate speech free speech, want to raise taxes on the rich,etc. The main area where the black community and democrats are divided is on social issues that weren't the focus of the 2016 election.
I'll let you decide based on this quotation what you think of him.
Aside from the polemic terminology it is basically correct.