The right-wing position in Denmark, IIRC, is to NOT raise the highest tax rate in the whole world. So supporting that isn't particularly right-wing.
That depends on whether you use the economic or the value-based scale to determine the left / right dichotomy.
But I agree that the term right wing populism is rather meaningless. If thats your point.
In Denmark people from the old Fremskridtspartiet, which was Libertarian, changed rather effortlessly into Social Democrats/welfare populists shortly after the founding of DFP in 1995. Which shows that economic policies are not central to those types.