Position players are different than pitchers in that they normally play the entire game. That means position players hit in every kind of situation, high, low and medium leverage.
Starting pitchers pitch more innings, but they are usually lower leverage than the best relievers. We actually call the best relievers “high leverage” relievers, as that is when they are used.
Generally, even with pitching in lower leverage situations, starters provide more value, but there definitely are exceptions to this, and way the Reds are using Antone in relief right now, he could be one of those exceptions. This is even more likely this season as teams are limiting starters innings, and using their pen more. This will all depend on how he is used and how well he performs, but he could be more valuable in relief than as a starter.