1. Success is very little on the idea, almost entirely on the execution
2. Execution has both a technical side and a business side, and can fail from a poor execution either way.
How this applies to your target audience:
You have an idea for a business? Nice -- that's almost worthless (1). You can't influence execution on the technical side, so you need to bring execution from the business side (2).
I like the numbers -- "a waitlist of 1000 people or LOI from 20 businesses" gives a better idea what kind of execution a non-technical co-founder should be capable of.