So how would the leakers know the terms of Kickstarter's negotiations if it wasn't in the contract?
Why do you think the language isn't real? Are you an expert in legal contract language?
I'll point out a few things about contracts and lawyers
1. Not all lawyers are good at their job
As a paralegal, I'm well aware that some lawyers are bad at their job. Even bad lawyers, though, had to pass the bar and and years of law school. The errors bad lawyers make are typically omissions of things that should have been included, bad citations, accidental inclusion of wording from prior documents used as the base for the new document, and so on. Even the bad lawyers aren't going to write something like the third paragraph there.
Contracts, even ones written in plain language, need to be very specific. Vague writing like "...if We somehow stretch Our decision of what is or is not objectional under these clauses too far, We will receive community pushback and bad PR, and We're more than open to being convinced that We made a wrong decision." I mean, what the hell does that even mean? Not your guess mind you. Exactly what is the definition of "somehow stretch?" What is "too far?" What constitutes "pushback" or "bad PR?" What does "open to being convinced" mean?
Judges and juries need exacting language and definitions in order to figure out who will prevail in contract dispute. Hell, even well written contracts can have language that might be found to be too vague, which is why contracts include a severability clause.
2. Lawyers make contracts based on their client's specifications, and stupid clients can make lawyers make stupid contracts
Bad specifications, sure. But they will still write those bad specifications in a much cleared manner than the claptrap from page 1.
3. There is a strong movement among lawyers to write contracts in simple and plain language when possible under the philosophy that understanding of the law and contracts should be available to all. I can provide you links to this if you are interested.
Again, plain language =/= vague. Vague = dead contract. What is written on page one isn't clear enough.
4. WOTC has a well-established history of providing plain language contracts, even of including rather silly jokes in them.
I've seen a few of those. Even those were, outside of the clear jokes, written much more precisely than what we see here. What we see here isn't a joke.