Such a statement needs to be understood in the relevant context. It's not intended to discourage kids from buying a Mac! Rather, it's intended to rebut critics who are already Mac owners and who scoff at the MacBook Neo technical specs, such as RAM. The computer is indeed not for them, people who can already afford a MacBook Pro, for example. The point of "This is not the computer for you" is the opposite of how the author characterized it: the point is that the MacBook Neo and its specs are actually fine for the people who are going to buy one.
For some strange reason, the author has invented an imaginary opponent to become offended by. We're supposed to cheer for the kids here, and I see that many people have fallen for it, but the whole schtick falls completely flat for me. The kids were never endangered or discouraged by the reviews of the MacBook Neo.