Welcome to WebmasterWorld Guest from 18.104.22.168
That includes the tab UIs, where you have all kinds of content hidden away in tabs, those kind of things.
there is no bolded sentence shown in snippet since it is not directly visible when the page loads (i.e. the sentence is visible only when the expanded section opens).
I do think not having a mobile friendly design effects the rankings when a user is searching using a mobile or tablet
"If your website has different pages to serve desktop and smartphone users and does not have tablet-specific pages, in our experience tablet users usually expect to see your desktop site rather than the site’s smartphone pages."