Without actually going through the effort of reading the article, I predict that the answer to the question "Did the media learn nothing from its disastrous coverage of Trump and Clinton in 2016?" is "The media learned nothing from its disastrous coverage of Trump and Clinton in 2016. Unsurprising, since for the media to actually learn from 2016 they'd have to admit how badly they fucked up, and they ain't going to admit anything of the sort.