This is fairly standard social democratic reformism.

I agree with Hawkins’ criticisms of major partyism, but many of the same criticisms could be made of minor partyism as well. Yes, the ruling class parties conspire to keep maverick candidates like Sanders  from gaining the presidential nomination, but they conspire even hard to keep minor parties from becoming competitive.

Presumptive Green Party Presidential Nominee Howie Hawkins explains why some Bernie voters are throwing their support behind his candidacy.