Earlier quoted context omitted.
He tries to emphasize that it happens in only "marginal strength areas" (see also this other post: http://daringfireball.net/linked/2010/06/29/gaywood-signal-i... ) but iPhone 4s displaying 'full bars' have been shown to suffer the problem (e.g. http://www.youtube.com/watch?v=tNmXrVNeGzs )
Without knowing more concrete information either way it's irresponsible to go too far in either direction.
I tend to agree on that criticism of Gruber but it isn't really worth pointing out. Everyone here already knows he is very biased and it is reflected in his writing.