First of all you should read this piece right here:
http://www.europac.net/whitepapers/T...bout%20CPI.pdf
It's about the CPI, how it is meassured and how they've changed it over the years. It also gives reasons why they'd do such a thing.
Second of all they took the "core consumer price index" in order to come up with that data as far as I can see. "Core CPI" is in essence the same as the CPI, only that prices for Energy and Food are excluded.
Once again, read the .pdf I posted. To me, if it looks like a duck, swims like a duck, and quacks like a duck it is a duck, no matter what government tells me. The same goes for recessions.