Task type had been renamed in past version of Nexus 3.
"Remove snapshots from Maven repository" has been renamed to "Maven - Delete SNAPSHOT".
Problem is that in new versions of Nexus 3.x , you still see the old task types when viewing existing tasks. If you create a new task then you see the new task types only.
This cause confusion when you can see two task types which are actually the same. Also the documentation would also only refer to the new task type name.
It would be expected that in new versions of Nexus, the old task type would be converted to the new task type name to avoid this confusion.