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It's kind of a weird phrase. Would normally "start a server". But yes, generally speaking, it's a one liner to expose $PWD:

python3 -m http.server

Which listens on localhost by default.

here's how trivial it can be:

https://gist.github.com/willurd/5720255 ("Big list of http static server one-liners")

Yup, I've never heard of that particular idiom used to describe the action of spinning up a local server, and it's not really something trivial as to not require some external tooling. So I don't know what's up with that.