Whilst I agree with the 3 arguments the author noted, I think it's pretty ridiculous that they used November specifically. I'm pretty sure it's the only period (aside from maybe October) where the PS3 has been down and kicked around (but I haven't checked).
If they'd used the whole year uptil this point, even if the picture were still the same, at least it'd be more credible.
Imagine the uproar if they had use vgchartz figures as opposed to NPD...
EDIT: Forgot to add, that noticeable difference thing is bullcrap, anything above 40" and there are noticeable differences (I'm running on a 46)