07-09 dont have afm enabled, but there are documented cases of those years being torn down and having the hardware installed (mainly 09, but i know ive seen an 08 with it too)
Very early L92's (Built Prior to April 1, 2006) had AFM hardware, Which would mean very early 2007 models. L9H engines never had the hardware installed.....Then you have the 2010 & up L94's with AFM hardware & enabled in the calibration.
No 2008 or 2009 model L92/L9H engines would've left the factory with AFM hardware, Just because a engine in a 2008/2009 model was found with AFM hardware doesn't mean the truck left the factory that way. In fact I've seen early AFM L92 crate/replacement engines in dealer inventories, Got one delivered to me once & I refused it....We worked out a deal where they supplied a Cam, Lifters, Trays, Gaskets, & Bolts...And I swapped out the AFM hardware.
GM installing AFM parts on random engines would create a service parts nightmare, That's why the AFM hardware equipped L92's is so well documented with date's & VIN breaks.