Parkinson's Law is incorrectly stated, as anyone who makes it to the second paragraph of the essay[1] can see. The pithy quote is just the opening sentence to the piece. The substance of the piece is far more interesting, and describes a law about the growth of bureaucracies. I strongly recommend anyone interested to just read the whole thing, because it's only 5 pages.

[1]https://www.berglas.org/Articles/parkinsons_law.pdf