Misuse of Term?
I suppose what he was trying to say is that it presents a Ranger-esque class that feels more like what some may subjectively believe to be more fitting than the dual weilding, one-level-wonder we now know as the PHB Ranger...
I'm inclined to agree with KK, but of course, as a DM, I've had the experience of seeing far too many Ranger 1/ Something Else X characters out there... Of course, it's my subjective taste, and I'm not going to try to argue in any objective sense because that's just pointless. It just so happens that I think that the Ranger as presented is just not worth a whole class, it should just have one level, it would pretty much have the same effect that it does on my side of things.
As for the Infiltrator, it's more of a Rogue with some Druid, Monk, and special abilities (Fast Movement, Woodland Stride, Trackless Step, Evasion, Uncanny Dodge, and Sneak Attack...). The biggest positive, IMO? No spell casting abilties. The biggest detriment for a Ranger comparison? D6 hit dice.