Absolutely if you are a client or prospective client it would be a fair question to ask.

But the fact that they follow a particular investment approach doesn't automatically make the point suspect.  The facts still have to stand on their own.  And unlike the Catou School of Finance the authors have actually used verifiable evidence to support their conclusions.

A conclusion that most people with any amount of financial literacy would agree with irrespective of their specific investment strategies or specific investments held.

Those who claim to be capable of timing the market with any reasonable degree of consistency are the ones holding "surprise goody bags".  

How many months are we at now since you called a market peak?  36, 48, 60?