Ohh...
Yeah, the max LLC setting does fry cpus, especially if you left the cpu input voltage - some boards have it as VCCIN - on auto.
Although the different vendors have different levels of LLC settings, the general consensus is to use either the lowest, medium(whatever's considered medium on your particular board), or in between.
Very high and extreme are liquid and LN2 territory.
In the 2nd pic: 1.305v is perfectly fine for an 8700k. But was VCCIN left on auto? VCCIN, or input voltage is the total amount of voltage being pumped into the cpu as a whole, which then feeds the cores, internal memory controller, etc.
If VCCIN was left to auto, LLC on max, and you ran it through a stress test...
I'll use my cpu for example:
7820x currently doing 1.25 vcore and VCCIN is manually set to 1.85v. LLC 4 is used. I have an Asus board, it has levels 1 - 8.
If I run a stress test for a few hours, the cpu still reads 1.25, but the min and max values of VCCIN is now 1.840 - 1.856.
If I do the same, but with LLC 5, I get a range of 1.856 - 1.872. It's still fine, I could go all the way up to 2.0 VCCIN, but that's simply not necessary.
If we take the 1.305 on your 8700k + max LLC is 8(might be 7 on your mobo), VCCIN on auto + vendors overvolt these things more than necessary as it is =
I can only guess, but the cpu was getting fed dangerous levels of voltage at some point or other. The VCCIN - before LLC max - was likely already higher than what I had manually.
And if you apply the same for your 9700k... I would look at the cpu input voltages.