Those numbers are from 2018. The train-pub in question was from 1949, and at the time ale would have been overwhelmingly the beer of choice - I suspect pilsner/lager wouldn't have been widely available in the UK.

I'm actually surprised cask ale is as high as 13.2% of all beer sold. While "craft beer" (I hate that term) is en vogue and has made people curious to more traditional style beer, the default pint in most pubs will be something lagery like Carling, Tennents or Carlsberg (all three pretty bad, but Tennent's has a nostalgia factor for me).