Ya know, I wish GW would put some more detail on the Chaos marines said no one ever! Seriously, WTF?!? These guys are a nightmare of detailing (Chaos Marines aren't supposed to be the stuff of those kinds of nightmares...).
I'm using the 'Legends' rules for my Exalted Champion as the *only* weapons fit for an Exalted Champion is a bolt pistol, power axe and combi-melta with no variations whatsoever. Very chaosy, every traitor exalted champion having the exact same stuff. Hell even Primaris Lieutenants who are known for their lack of options have more variety than that!
Even then this guy technically has an illegal weapons fit, as he has a mere bolter rather than a combi-bolter not that any future opponent will likely mind as it means less shots coming their way.