The OP was talking about removing the child from machines, not whether she was alive or not.
Hence saying “It is the law of the land, if you dont like it you can work to overturn it.” refers to removing from life support.
And PBA was discussing the case on YWN CR, hence it would be flavored by the hashkafos oof the site participants. hence, if PBA does not consider the California law as truly defining death, why should he call it so.
And it is clear that brain dead is not the same as a coma by some of the comments here. No comments are written by someone in a coma, but a number are written by individuals who appear brain dead.
Does being rude help make your point?