No, QNX and RIM actually came from the same birthplace - the University of Waterloo. I bet you the principles of each company even had beers with each other when they were in their salad days, debating technical decisions, or hashing over names for their respective products - So for RIM engineers, buying QNX is pretty much the equivalent of reuniting with your long lost twin brother. While they are in radically different industries, and have radically different products, the laser sharp focus on engineering is the same.
And I bet you any RIM engineer you ask will definitively state that QNX is a much better real time OS [focus being on real time] than anything RIM has ever put out - it's akin to asking whether your kid brother who competes in the Olympics is good at their sport or not.