I doubt Lucas had much to do with Mandalorian lore either way.

How could they make Obi's death look like an accident if the mine was supposedly shut down? So, our investigating Jedi wandered into the mine and started playing with the crushing machines?

Dooku wants to trigger a Republic invasion of Mandalore so he can say, 'look, the Republic doesn't respect your neutrality, I will come in and save you'