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#1
It is that other if removed, but they do not know where they are or see them in the registry.
Many of those 'native' context menu entries have one or more CLSID, (Class Identifier), entries in the Registry that point toward the context menu's function in numerous areas of the OS.
To find all of them in the Registry, making sure they are the proper ones, then disabling or eliminating them would probably start breaking things in the system.
Best to leave them.
There is also no single context menu.
You have one for File Explorer, one for Desktop, Start Menu...etc.
If you're really going to attempt this.. and I suggest you don't..
Backup your PC's registry first..