That's an impressive strong built block.
It will be interesting to see how the chains hold up in these engines because driving the injection pump off a chain in 6.2/6.5 GM engines resulted in nearly a 1/2" of stretch in under 30K miles and that is a small 350 pushrod size chain design. Of course this affected valve timing and IP timing. the IP pressures, shock loads, and vibrations stretched the chains out.
Interesting the intended design use. I don't think Cadillac will ever use a diesel after the 5.7 Olds disaster. It wouldn't sell. Even then Cadillac is known for 100K mile throwaway engines so the Cadillac bar is pretty low.