Collection notifications access deleted objects change parameter

In the RealmSwift SDK, when using .observe( ... ) to get a RealmCollectionChange this only gives the index of the deleted item as shown here by using

.update(_, let deletions, ... )

where deletions are the

“indices in the previous version of the collection”

Is there a way to access the deleted objects or at least their id? Or is the only way to always copy the synced data into a different place on the client and update it after every update of the synced data, so effectively keeping two copies with one being manually updated?