Parent is talking only about 2 player tournaments - that's what the "heads up" part of the description means.
Heads Up specifically means that there are match-ups between 2 players. This doesn't mean it's necessarily a 2 player tournament, e.g.
https://en.wikipedia.org/wiki/National_Heads-Up_Poker_Champi...
I already checked this case and you are right, indeed.