The title says it uses 3 birds but if your watch the video, the guy uses 4 birds.
There are multiple strategies to beat each level. That doesn't necissarily mean that the one strategy in the video is wrong. As long as it gets 3 stars, any tactic is correct.
Oh wait, I see what you mean. Yes, that would mean that the maker of the video titled it incorrectly.
What do you think?