From that page:

> A contingency plan is a plan devised for an outcome other than in the usual (expected) plan.

That sounds a lot broader than emergency preparedness.

Emergency preparedness is a tiny subset of contingency planning since real emergencies are so rare compared to mundane day to day problems like a truck breaking down or too many people in operations calling in sick during flu season. The less glamorous parts of the job mostly include calling alternative vendors in a rush trying to get something or someone replaced without making it appear like they're desperate.