The paragraph starts by saying viewership is down across the the three major news networks. That’s not exactly across the board, but means the same thing.
Cable viewership across the three major cable news networks is, on average, down 19%.
It's specifically not "across the board."
If Foxnews and Skynews were down 54% and 33% and CNN was up 19% how would they write it? Still on average? Or those mean right wing news outlets are doing terrible, but the good Left wing CNN is taking up the lead!
They listed the top 3 cable networks. If Skynews was one of those, presumably it would be included...
That's digging really hard to find a conspiracy. They didn't mince words, in two sentences they gave the full details. All in the same font, same paragraph.