But they included Foxnews in the first sentence where they claimed it was down "across the board".
It's specifically not "across the board."
“Across the board” means something closer “true in every case”. Though as I type this, I realize some people my think of it as “in total.”
“across the three major cable news networks”
Which I paraphrased as
“Across all the channels”
Which the person replying to me changed to
“Across the board”.