Excellent write up! I also have a G15 (GA503RM), and the post made me wonder if I ought to be doing this as well. The temperature improvement makes a strong case. How much of a danger is the (nearly) escaping liquid metal on the CPU? Is this is something that could be frying a lot of Zepheri if it's not addressed?
The LM escaping shouldn't be an issue with silicone over the on-package capacitors and foam around it. If you aren't throttling I wouldn't really bother.
If you do end up attempting it removing the LM is easier with a syringe that can suction the larger blobs away. Could even just try to reapply the same LM you removed if it's just a pumpout issue
I would say if your laptop starts doing sudden thermal shutdowns then liquid metal should be your first suspect. However, I do have a slightly older all-amd variant (G513QY) which may behave differently. Comparing my case with the article, they noticed CPU throttling and had dark/black marks on the CPU, whereas I was encountering GPU thermal shutdowns with marks on both GPU and CPU.
Rough timeline for my laptop was:
14 months in, manually under-clocked discrete GPU to prevent thermal shutdowns
20 months in, complete cooling failure on GPU, replaced liquid metal with PTM7950
