How hot does the CPU get under load? And does it have a GPU?
Kryonaut isn't the best thermal paste for a laptop, particularly one that gets pretty warm under load. My Thinkpad P1 dried out/heat pumped out the Kryonaut in about 6 months to the point that I was getting REALLY bad performance. But this is also a machine that runs at 100c under full load. My old W540 would get well into the 90s which dries that paste out quickly.
If you ever notice any degradation I'd suggest a thicker thermal paste that's less prone to drying out/heat pump under high loads. I believe Gelid extreme is what I bought for my normal laptops. I put the PTM 7950 stuff on my P1 and I'm never looking back.