I'm following tutorial, chapters 7, 8 and 9.
https://nextjs.org/learn/dashboard-app/static-and-dynamic-rendering

In chapter 8 they say:

In the previous chapter, you fetched data for the Dashboard Overview page. However, we briefly discussed two limitations of the current setup:

The data requests are creating an unintentional waterfall.
**The dashboard is static, so any data updates will not be reflected on your application.**

and later they transform it to streaming, but also neither the component definition nor fetching functions changed - so how is that it becomes dynamic now?

from what I understand - static built at build time, dynamic - on every request.

so given that how is it possible that it was static previously and now it's dynamic if they aren't changing anything substantial in those chapters, like component definition or data fetching function that would "tell" next - "hey now make this component dynamic and calculate it on every request"?