Delegates are pledged on the first ballot to vote for the candidate for which they were elected as a delegate.
If a candidate withdraws before the first ballot, the candidate’s delegates are free to vote as they please.
Sinilarly, if a candidate withdraws after the first ballot, his delegates are free.
After the first ballot, all delegates may vote as they wish. Candidates cannot pledge their delegates to another candidate.
I think they are talking about before any delegates are awarded. I doubt that any of the <2% crowd will win any delegates but they can drop out and encourage their supporters to vote for whomever.