It’s a refutation of the literal phrase “chosen by the donor class” because there are more players that have an effect.

Trump is the candidate of the reactionary petite bourgeoisie.[1] These are not part of the Donor Class but they have enough power to, when times are “bad” for the lamestream candidates, elbow in their candidate.

[1] The mainstream media likes to say that he is the “working class candidate” without any seeming basis in reality