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They're not wrong, just misleading. A typical person consumes 60,000 kilogram calories a month, AKA 60 million gram calories.

http://en.wikipedia.org/wiki/Calorie

OK, so that's about 17,000 users, or maybe twice that many orders if the typical order is the 2-week size. That's about 1000 transactions a day, or about 2 transactions a minute.

That transaction volume could be handled on a shared server with CGI programs. Why do they need so much computer infrastructure?

Exactly!

Maybe they are using the physics definition of calorie rather than the dietary definition of calorie (a 1000x difference).

calories vs kilocalories, I suppose.