Good point. All-22 tape, which is defined in the article, is footage of a football game that shows all 22 players on the field simultaneously. It is almost certainly not the footage you'll see if you watch a game on television, which follows the ball or, more rarely, individual players.

Of course not. That's why the article explains it in the second paragraph.

No, but since HN has a policy of using only the author's title, the OP can't change it.