I doubt that Trump has anything to do with it, except that both Europe and America have their far-right pseudo-populist movements. And have for some time. E.g. the worrying influence of the LePen party in France, Wilders in the Netherlands, and some scary right-wingers in Poland and Hungary. In Austria itself, the late Jorg Haider had a great deal of influence 15 years ago and his party was for a while in the governing coalition.

In America, people from Joe McCarthy to George Wallace to Jesse Helms have had terrifying influence over the years, though admittedly none of these was a main-party nominee for the presidency.

While both Trump and Hofer are anti-immigrant, they are mainly preoccupied with different groups: Mexicans in the former case; Syrian refugees in the latter.