This is what he is referring to:
I am not sure they are necessarily agitators (unless there were posts deleted that I didn't see, I only pop in every few days over there), I think they just aren't convinced that the emissions equipment is shortening the life of the modern diesels. I also fall into that camp, as I have yet to see evidence of shortened motor life. Our family farms, and our old diesels don't get any more hours on them before something goes wrong than new ones. You get the occasional old gem that goes forever, but there are new trucks out there with 500k+ miles on them too.
What there is evidence for is the DPF regen on the 2007-2010 trucks diluting the oil. GM knew that, and every regen shortens the oil life, so it gets changed before the dilution becomes a problem. Plus, on the 2011+, they put a 9th injector into the exhaust so they no longer have to use post-injection to regen, which eliminates the oil dilution. I would personally consider a delete on a 2007-2010 for that reason, but I would leave a 2011+ alone (tune only).
That being said, if you want to delete your truck, and live in an area where you can get away with it, there are lots of methods to do it. This forum is not going to be particularly friendly toward deletes either, because we are all very much into diesel performance, and many of the people who delete their trucks go around rolling coal and bringing the EPA down on our heads. Or at least that is the perception.
There are many vendors on this site who will provide you with a delete tune to make everything work. I am with JD Dave, just get a delete pipe. Easy to swap back in for smog tests. And for the same reason
2016 gmc duramax delete kit, I would just block the EGR, not delete it. Blocking it has the same benefits as deleting, but will pass a visual inspection, and is much easier/cheaper to do.