since LM is in play nobody will assure you in a way so that you will not have to look for yourself.
After a year i would have a look anyway and polish the surfaces.
Btw: ... is this an early 2018 8700k that you then delidded in 2019?
The newer ones can clock higher with far less heat than you post.
I had a 8700k with the same stepping the 8086k had.
The 8700k ran 5.1 @1.325 manual vcore on air with 0 avx /LLC5
The 8086k ran 5.1 @1.315 manual vcore on air with 0 avx /LLC5
I saw low 80s temps if i hammerd the cpu with AVX loads.
LLC6 lets you lower vcore about 0.03 - In the end is always produced more heat for the same result.
And that is on air with no delid in a proper case in a cool country.
ps 8700k and 8086k are dirt cheap atm. So much so that nobody will touch a delidded one.