It is possible they are doing that call back intentionally. Though I personally think the reason Tyrael's sword didn't harm him is simply due to becoming the Angel of Death he's learned some for of intangibility. Or could be as simple as Death doesn't discern between just and unjust for why the sword of Justice can't stop him.
I do agree that I think that Mathael's goal is the destruction of All demons, which unfortunately for Sanctuary means all humans must perish as well since they are all half demon.
Honestly I always took Diablo's line from D2 when he's summoned, 'Not even Death can save you from me." As that even after he kills you he is just going to spend an eternity torturing your soul.