In that it lacks the 4 GCDs of ranged attacks per minute (that, frankly, wouldn't much fit DRK anyways), sure, but... in any other sense, tuning be tuning (and the Conf Combo itself had to be buffed, what, 3 times(?) to reach its end-of-EW relative potency)?
It's a skin improvement over Bloodspiller_x3 with the unfortunate side effects that (though this is very much like original Req combo) it reduces freedom of choice between AoE and ST spenders and interferes with normal combo access during Delirium. If I were expecting more from it than that, I'm not sure Delirium would be the best trigger for that further, actually gameplay-changing effect. I'm not also sure it would best fit with said combo. (I.e., anything more than the reskin and potency update... would be a separate mechanic best discussed separately.)