Why does this article call them CTAs? Being a "commodity trading adviser" is a CFTC regulatory status, not a trading strategy. Those issues are orthogonal. One would have expected them to be referred to as algorithmic traders or algos or something.
My understanding is that CTA is a general term for a hedge fund that uses trend following strategies, primarily trading futures, but not actually restricted to commodities, so it's not a particularly accurate name, just industry jargon.