Interesting post! Have not heard about Gompertz–Makeham law of mortality before. I guess one of the reasons that they live so long as you mentioned is because they have very good DNA repair mechanisms, and they seem to be very resilient towards oxidative stress.
Also, the extremely high molecular weight hyaluronan they have in their skin, to protect them against rocks in the very narrow tunnels (they also lack substance P and do not feel pain), is protective against cancers. Perhaps, they are so protected against cancer due to an evolutionary 'accident'?
The naked mole rat is one my favourite animals, and I even wrote my first and only biology post on Steemit about it: https://steemit.com/science/@janusface/the-naked-mole-rat-guaranteed-cancer-free
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Yeah, the reasons you mention are probably why they are even able to do this, but it's still pretty extreme that the DNA repair mechanisms do not seem to get any weaker at all.
This is an interesting thought, and I cannot really make much more than a guess on this point. But it's very interesting that they seem to be naturally resistant to cancers in general, because most cancers are very different from each other in terms of how they attack the body, so this could maybe have potential for future treatments.
It's very cool to see that you like these animals so much that you even wrote a first and only biology post about them. But I get why you like them; it's difficult to find an animal that is as unique as this one.