The statement that the stolen data was used for the campaign is contradicted by the interview link provided.

Ah, I see what you mean, yes: it's denied by the campaign manager.

In the immortal words of Mandy Rice-Davies, well, he would say that, wouldn’t he?

I think the evidence is circumstantial but sufficient to warrant further investigation. CA harvested illegal data, used it in the Cruz campaign, lied about removing it and were then very involved in the presidential election, all within the span of a couple of years.

Parscape's denial is not in itself evidence, but I do agree with rsynnott that it's neither here nor there.