Yes, it describes a person that is the opposite of-hot headed. It describes things, too, anything that doesn't temper a cool person. Handling of hot shit requires increased energy conversion resulting in excess heat. When that is seen as a negative, cool generally describes a positive.
It's use might be a bit more contrived than that, but this is simple thermodynamics. Temperature is one of the most basic perceptions, certainly it's rooted deep in our understanding of the world. Language is littered with expressions related to temperature, eg. emotional warmth vs a cold heart, because temperature perception is that fundamental.
>> it's not enough to be fun to be commercially viable - there has to be a hype factor(premium) or a monetization strategy
> That sounds like you want over 100% fun. Hype literally means over.
My point was that even though words might have a literal meaning they can also have other meanings, and in that case the person meant the other meaning
hype
informal
noun
1. extravagant or intensive publicity or promotion.
"she relied on hype and headlines to stoke up interest in her music"
It's use might be a bit more contrived than that, but this is simple thermodynamics. Temperature is one of the most basic perceptions, certainly it's rooted deep in our understanding of the world. Language is littered with expressions related to temperature, eg. emotional warmth vs a cold heart, because temperature perception is that fundamental.