Maybe it was implied though.

I think the title of the whitepaper did this but people like to ignore it

The white paper was about censorship resistant money, not cat pics.

A Peer-to-Peer Electronic Cash System? Yeah I’d say it’s more than implied, it’s the definition.

Cash --> Cache --> "a place to store valuable things" Think, supply-cache, weapons-cache, data-cache. Value is subjective, and ironically, cash leaks value more than anything; it's a very poor incarnation of a cache.