He typed it clearly, I'm guessing you have reading problems.
What he meant was they could change anything about the game up until 6 months prior to release((that includes the time it takes to ship and stuff like that)). But after that 6 months they can't do anything. So he is trying to say the game will be a little outdated.
What he fails to realise is, if they decide to change something, it puts them behind schedule and that 6 month period is delayed, resulting in a delayed release.