I’m from the Astra theme and a bit disappointed with this quote:

Some users who switched from the Astra theme, another one commonly used by Elementor users, have reported significant (50%) decreases in loading time on real world sites after switching to the Hello theme.

I think it is not OK to mention this in the article based on a random comment by a random person. Speed testing tools like GTMetrix show different results based on various other factors.