I would say his prediction was more than just coincidence -- which he made when Trump was among 15 candidates vying for the GOP nomination. His raw odds then of being right were 14:1 against.
He also doubled-down - with qualifications - once Trump secured the nomination. Almost everyone else - including myself - saw the general election as a Clinton shoo-in, given Trump's numerous deviations from what most of us had believed were political candidate social norms, among other apparent disadvantages.