Only the first netbook came with Linux. The Asus EEEPC 701. This was mainly because it was so underpowered it couldn't run windows (and some nonresizable dialogue boxes didn't even fit on screen). But they dropped it with later models.
As owner of an Asus 1215B, that lasted from 2009 until last year, having gotten disk and memory upgrades during its lifetime, going through all Ubuntu LTS upgrades, bought with it pre-installed, that is certainly not true.
The 701 did run XP, even came pre installed with it on some models in later 2007!