Hide "Open Folder..." command from Default package
FileManager didn't hide the built-in OpenFolderCommand(Open Folder...) even though it provides its own equivalent (Open in Finder).

It did hide the built-in OpenContainingFolderCommand already so I'm guessing that this was just an omission.
The small change in imports is due to pyright type-checker reporting that class can't inherit itself. It might have worked in practice but I think this is more explicit and clear with my change.
Open Folder opens a new Sublime window, it doesn't open the file browser, so this is not needed.
Nah, it opens a finder window:
https://github.com/user-attachments/assets/76a4e61f-2083-4451-9f0b-c0466b654227
But this repo seems dead so I don't see this being addressed anyway
My mistake, I was thinking of Open Folder from the File menu, although your screenshot clearly shows the context menu.