What the article is saying is that the threat of bail (in an amount that a defendant can't pay) makes plea deals more likely, which currently keeps actual trial

What the article is saying is that the threat of bail (in an amount that a defendant can't pay) makes plea deals more likely, which currently keeps actual trials from clogging up the court system. If someone were to post bail for them they could still go to trial without sitting in jail in the meantime.