No way, this guy is way too scrawny and wimpy to be Liefeld's work... but the picture doesn't really seem to fit with what I think of when Kas comes to mind. Bad enough they recycled a piece for him, but they definitely picked the wrong one.
I guess they couldn't fit or didn't like the picture of Kas that was in Dragon back when they did the Vestige article for him. That was a full-body pic of him with sword and everything.