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That figure is probably arrived at using the Bobby_M method, there not only all water used in growing and malting the grain is figured in, but also the soda the guy driving the tractor drank.
From teh article...
Nevertheless, with 98% of that pilsner's or lager's water footprint occurring before the brewing process begins, sustainability experts and community activists are urging beer companies to lean on their agricultural suppliers to reduce water consumption.
So yes, they included irrigation water, etc.