The reviewer means that post title should be bigger that title widget. It’s called typography hierarchy, so attention firstly must be on post title from user and then on widgets.
@MaitreArt for your kind information, The font size of the post title is 20px and the font size of the widget title is 18px, you may check here News – Adhira
Just look at the latest approved items, check the blog page. Compare their titles. The difference between 20px and 18px is too small. Make it maybe 36px and 18px.