If we believe the Brody report, Cruz strongly implied that Trump is corrupt, which I think is just as damaging a claim (whichever way the claim swings, might boomerang) as the one that Trump voters are uneducated and ignorant.
The more PC or mild form of claim that Cruz is making is that Trump is a Washington insider, not by being inside, but by working with those who are inside. In contrast, he claims, he has consistently been fighting against the established political order, and will continue to do so.
If you go to the source, there is a video of Cruz saying exactly what is reported here.
So you decided to one step further than Cruz and explain what he said to us because we can’t understand the article by ourselves?