This doesn't sound to me like price fixing, I would think that would be done in closed doors, not at a public restaraunt.
Having said that, I do believe there is market manipulation, but I think it is more like hedge fund leaders getting the press to come out with articles of "labor report is bleak" - stock goes down, then they buy, then they tell the press to say "labor report shows increase", then stock goes up, then they sell. Seriously, if you look at the stock prices in the past 6 months, there have been swings of 20-30% back and forth at least 4 times this year all which were reactions to supposed "labor and real estate reports"
In this case, the guy didn't give any proof, on why they were having a price meeting only that they were hush hush when he walked in. What do you expect when you are told you aren't welcome at a particular function.