From evilavatar.com: " If you ever come across an interview with an anonymous developer from Valve, it might be a good idea to take a closer look if he uses terms like 'complexer'. It looks like the supposed 'interview' with an unnammed Valve employee was actually cobbled together forum posts by a ps3forums poster named 'HalfLifeDev'."
PSU.com – Official Response to “Faked” Interview Claim.
"Contrary to recent claims - we did not fake a recent interview with Valve. This is a wildly preposterous and libellous accusation that is completely unfounded and we treat it extremely seriously.
We have no reason to “fake” an interview and we would urge any proponent of this claim to take a serious, revised and considered look at our list of recent interviews we have conducted with many of the leading games development companies, publishers and industry experts in future before making such a baseless claim."