From the BBC website…
I’m surprised it’s not because they “scored more goals than their opponents in every match”.
Tongue out of cheek, “the best football” is a meaningful piece of jargon which refers to the aesthetic quality of the game and not necessarily brute efficiency at putting the ball in the net.
Also significant is the word “deserved”. The headline is a quasi-religious statement; deservedness is akin to moral righteousness. Football struggles (just like any other sport) in a constant battle of trying to protect the game from negative (but effective) defensive strategies. It’s refreshing to see the right team win.
Thank you, Fernando.