The GOP doesn’t really have superdelegates because state parties can bind their votes in various ways. Dem SDs really are free agents.
The RNC allows them to be uncommitted, but also allows their votes to be determined.
They are automatic delegates in the sense that they don’t have to be elected at a state convention. However, since they are RNC members, state party members have indeed voted on them.
Almost every state has 3 unbound delegates, usually state party officials. A couple states send all of their delegates "unbound". It is not nearly as many as the Dems do, but there are enough that it could make the difference in a close race.