This is ironically good advice because its bad advice.

These kind of general statements about how an mvp should take x weeks are pointless because each project is different. Which is an obvious statement. So is the suggestion that you should launch as fast as possible.

Launching quickly, failing, is a really good way of understanding time management on a macro scale for an entire software project/startup.

And its not just about pacing or knowing how long a feature should take to develop, but many many things like which feature to develop at which point because it might be much more difficult later on.