I take that as an error.
Is anyone saying it's not an error?
But as Tvboy so rightfully puts it, it's a fairly easy one to fix and the game would be better off all in all with the change.
Maybe that's just me though but I find it frustrating at times to have to check the FAQ to see if an upgrade card has been changed from the original text.
You must not play many board or miniature games then. Although the vast majority of the FAQ isn't really fixes, but rather clarifications of the existing rules.