I don't see how the conclusion is correct based on the premise: "That’s why I don’t want to hear people’s ideas. I’m not interested until I see their execution."

As per the premise, wouldn't you want to quickly vet out the idea to see if it's > 0 or your hurdle rate multiplier? If idea is Awful (-1), no level of execution is going to result in a desirable outcome.

This premise shows exactly why idea vetting is important.