You misinterpret what he is trying to say. It's not, "oh, only a few people can play in open beta". He is just defining how -they- attack the Open Beta portion of development. February will be for press only (to bring up hype for marketing), followed by March which will probably have Guild Wars veterans, followed by the April weekends which will be limited to a couple of weekends.
As he said, "To some people Open Beta means unlimited access to the game and everybody on the interwebs can play it. This is not what we will do." This means that everyone (or almost everyone) should have access, but it will be for a weekend and have a limited amount of content to explore.