I think he was joking. Technically most maps are flat. The ones that aren't are called globes. We've believed in a round earth for about 2,000 years, and during this long period of time, funky projections were not always used.
I'm pretty sure it's a site that seeks to satirise pseudoscientific belief. They just happen to be very good at keeping their poker face on to get people riled up.
Most globe-maps are flat too, when you think about it. Just paper (or anything like it) strapped onto a "skeleton" or round structure of sorts.
Not that it matters.
Oh my god! Are theese guys http://theflatearthsociety.org/forum/index.php?PHPSESSID=1c1677cfc95d8cd33642445a7e889d81&topic=20725.0
This place is worse. Too bad I could find an english counterpart. Anyway, I bring to you: http://www.svedimf.3w.se/!
For you who actually are a dolphin.