Are Mega Games Larp?

The Condo Selling/Home Buying is going well. But it's still massively distracting. As you can imagine I have little time to be writing larp rules at the moment. One of the distractions lately is Shut Up and Sit Downs annual attending of the Watch The Skies Mega Game. Part board game, part theater, packed full of mini games... Is Watch the Skies actually a larp?