So, I guess I should ask if you've read the wikipedia article:
http://en.wikipedia.org/wiki/Flying_disc
Sounds like they're also talking about pie tins.
I'm not sure of your point. The wikipedia article appears accurate and is well-sourced. I have
most of the books listed as references. Pie tins certainly have a big place in Frisbee pre-history.
The Wired posting (it isn't even long enough to be called an article or even a column) is written
as if two guys made a couple of design decisions and viola! -- the modern Frisbee was created.
In reality, there were thirty or forty years of Frisbee history that included stagnant periods,
dead-ends, and several incremental changes before those early discs evolved into what are
used today.