Correct!
It's not his fault that he has a wooden leg. Ok, he complains about attempted murder right after he falls, but that's because it's too embarrassing, and he has an ego. I mean, that sort of clumsiness makes Jar Jar Binks look like Ronaldinho (wait, Jar Jar Binks does kind of look like Ronaldinho in some other way... well... whatever...). In fact, I was expecting something like that when I saw that he had a good position to shoot... with his right foot. C'mon, we've seen him shoot like a 2 year old baby with his right foot, it's not like it was a big surprise. To us. Maybe the referee didn't know that Alba has a left foot and something resembling a leg on the right side that helps him with stability and little else. The referee, obviously, didn't see the penalty. He just tried to reconstruct the events, having in mind that Alba is a footballer that plays for a world class team, and just couldn't believe that Alba fell because of some quantum fluctuation.