CNN enforces status quo RULES and attempts to persuade their audience that Cornel is only part of the third party puppet show.
The spoiler hypothesis has been shown invalid. Big data shows that people who go third party would not vote for what they consider less stinky shit. Instead they don't vote.
I voted for Jill Stein. I can attest I would not have voted for Biden to stop the country from electing Trump. I simply would have said:

and not voted.
Spoiler - A turkey who would run and STEAL DEMOCRATIC VOTES necessary to defeat the evil one. Which this time around is Trump? The 'Evil One' is always the Republican. Spoilers refuse to follow the phony rules of American politics.