This doesn't surprise me. Having dealt with engineers, they occasionally like to use hyperbole and use colorful language to try and emphasize a point, sometimes far beyond the reality.
The fact GM had to put out a document like this tells me they have such a problem with engineers who don't realize that using such language in official documents will come back to haunt the company later on. It's a shame when companies have to go to this extreme but some employees just don't get it unless you spell it out in black and white (not that engineers would be a prime example of that...).