That's kind of a circular argument. The demand generated by their own profession is due to the laws on the books. One corporate lawyer can't sue another unless the system lets them.
So the job isn't bullshit as long as those laws exist.
The whole idea of "bullshit jobs" seems to focus on the job, not the environment that produces them.
Any such profession is a category of bullshit job in the book, whether or not you personally think corporate lawyers produce value to the world.