I have deleted two PB's in recent weeks, using the right-click Delete in the tool:-
- both were removed from the tool
- one was removed from Library but not deleted from the Resources folder (Logos 9.8)
- the other remained in Library (Logos 9.9 SR-1)
- I had to manually delete both from the Resources folder
- most users won't know how to do this when it is removed from Library
- neither PB had been Uploaded.