The two points is legit.
You are up 4…. Scoring a single point still means they need a td to take the lead, and tgey can win with a td and missed xp… two field goals also win it… if you score a field goal they tie it with a td plus xp
Going up 5 nothing changes except if you score a fg they need a 2pt conversion… its still a one score game
Going up six means tgey need a td and xp to win
Two field goals just ties
If you score a field goal, the game becomes a two score game…
That is basic late game football chart stuff….