Ah, yes, missed that. My point about the agreement stands though. The email on page 11 appears to state that they owe him $30,000, if he just provides some demographic info. They then send him a contract weeks later, and use the phrase "formalizing the terms ... [of] the reward payment" in order to try to make it look like this is all part of the process. But this the start of a new negotiation.

Edit: I'm getting downvotes on my comment above, and maybe it's because I missed the part where he said he consulted a lawyer, but I have a suspicion that it's because I suggested the threat of a lawsuit. I know we live (in the US) in a overly litigious society, but my point is that the company is (perhaps through disorganization or communication problems) trying to alter the terms of an existing agreement. This is what contract and tort law is for. Sometimes the threat of getting the courts involved can cause the other side to see more clearly what is going on.