Does that actually give any idea? I thought those 192K pages mentioned "google_ad_client" in the visitor readable part of the page rather than in the html. That's maybe why so many of the high ranking ones are blogs.
Click on page 10 of the Yahoo results and Yahoo quickly revises its estimate to 117K pages. Change some numbers in your URL to go to page 86 [search.yahoo.com] - yup! 482K results.
It looks like Yahoo! is as numerate as Gooooooogle. :) I do wish they'd make up their minds which autogenerated pages are pages and which aren't.