Having evidence that the fears are based in reality and proposed policies that would help said people is a point for the latter, obvious contradictions in those one for the former.
Proposed policies being realistic vs vague broad strokes that are unlikely to be legal to implement would be another indicative axis.
I suspect that having "obvious contradictions" in policies is an extremely high bar for modern political groupings generally - ie all political parties and their leaders are populist now.
Proposed policies being realistic vs vague broad strokes that are unlikely to be legal to implement would be another indicative axis.