Well, yes, small beer does have its place (or at least it did when it was used as refreshment/nourishment for agricultural (and other) labourers. I don't quite think that's what Guinness has in mind.

By the way, if you live in the Maidstone area and you like stout, you can avoid the chilled, gassy and nitrogenated (is that the correct word; and it is nitrogen that Guinness uses, isn't it?) stuff that's foisted on us everywhere else and try Goacher's stout. The pub where I drink it serves it gravity-drawn direct from the cask at cellar temperature. Big G isn't even in the same league!