I find myself wondering the same thing every time this topic comes up; are Keurig REALLY that dominant? Shouldn't this be the end of them? If I can make an equally good product and put "accepts all pods" on it, wouldn't that sell like... well, a lot?
You are confusing two different kinds of "Early Access". The one you're thinking of is where people get to play early version of a game, often by paying (though not always).
The kind talked about here though is where reviewers get a copy of the finished game before it goes on sale. Think of it as the equivalent of having screenings of a movie for critics before it premieres.
To me the letter sounded more like "your threats are so pathetic that you are not even worth the time it takes to school you properly, so I'll just point out that you obviously don't know the law and leave it at that".
Basically the worst insult a Klingon lawyer could give someone. ;-)