I believe this is incorrect.
I recently bought a CPO'd 2008 GS350 with appx 20k miles. My understanding was that it carries a CPO warranty of 3 years or 100k miles, whichever comes first (see Lexus CPO webpage here: http://www.lexus.com/cpo/overview/warranty.html).
Yes I agree with the latest comment, if you buy CPO, it's 3 years or 100K Miles whichever comes first. That's it.