I didn't listen to the call, just read the statements and collected what information I could from them.
But I did download the slide deck, look at Slide #5 of 15. See how all the CPC numbers for all the properties are down.
Now look at how Paid Clicks (page 4) are up for the same periods. More clicks, less money per click. It includes their AdMob business (aka Mobile) but blends a bit because is a search ad on Android a O&O (Google Sites) click or a mobile click?
But there is a more interesting point here. If we stipulate that Simpson's paradox is at work here, and we stipulate that Pichette is interested in communicating clearly to the shareholders, would he not have the fiduciary duty to disclose the confounding variable?
After all if the appearance that the value of Google's search advertising business is eroding away, and that is, rounded to the nearest billion dollars the only business that makes Google any money[1], as an officer of the company you would want to say "Sure it looks that way but when we break it out you can see that really we're doing fine." otherwise you would leave people with the wrong impression, and they might sell or buy your stock acting on that misimpression which might form the basis for future litigation against the company. (This happened a lot in the 90's btw).
For me, I tend to be skeptical (its my nature), so if Pichette wanted to convince me that the ship is doing fine, he needs to let me know why there is water in my stateroom. :-)
[1] Youtube is catching up to be sure. But pretty much not a whole lot more is.