“As far as I know, it’s entirely unnecessary for them to have it”
why do you assume this? they brew a number of “craft” and “small batch” specialty beers too. why not see what the star k themselves has to say about kashrus of beer. http://www.star-k.org/articles/kashrus-kurrents/2183/beer-halacha-clarifying-the-kashrus-of-beer/