Robert C. Guns:
Are you 250+ right now? Even 220 would be considered massive to a lot of people. I don't think most people comprehend that the World's Strongest Man competitors are almost all well over 300-lb. Even Rob Kearney is 285-lb at 5'10", and he is the SMALLEST guy at that level. In fact, Kearney is so obsessed with flaunting his gayness that I forget how impressive he is.
Also - have we identified these giant twins yet?
Is it possible that the restaurateur had just heard that twins would be competing, and saw two unrelated competitors and assumed they were twins based on their size?
I'm not aware of any other WSM level twins, other than the Stoltman Brothers.