That text (here and in magazines, newspapers) isn't for you. It's for the casual browser who isn't reading the article yet. It's trying to suck you in and/or give you teensy bite of info even if you don't read the article.
https://en.wikipedia.org/wiki/Pull_quote
Of course this article format is kinda pushing the limits I agree.
I admit to often reading things that are far outside my wheelhouse, or not always topics I assume I will enjoy. If I start one of these and find myself loosing interest, these quotes and call outs can draw me further in or push me right out.
Of course this article format is kinda pushing the limits I agree.