I hadn’t heard of the metaphor before and understood it based on the words used.

Flywheels aren’t some kind of academics only term. If you’ve ever touched a mechanical fishing rod, you have used a fly wheel.

I'd never heard of it and my best guess based on the name would have been some kind of way of "storing up" marketing effort to release it later, like if you had extra marketing $$$ and needed to use it before the end of the quarter but would prefer to spread it out.