It's not an amazing game plan if you need a handball to win the game but fair play to Arsenal, they played pretty well and took advantage of a misfiring Bayern.
The game plan was to sit deep, counter quick and incisively. They did that, which then causes mistakes.
Giroud handballed it and Neuer went walkabouts. It's absolutely about luck. Was that in the "game plan"?
As above, the game plan was quite obviously to sit deep and frustrate Bayern, and to counter quickly. That is always going to create mistakes, and that's what happened.
You know when a team gets a result when they have been written off by pretty much everyone, and you still can't get any credit - It comes across as nothing but bitterness.