Quite a comeback for a company that was not doing well a decade ago (pre-Zen).
Krzanich "optimized" the company for profit, by cutting out things he considered to be excess. Including a lot of their irreplaceable validation & verification talent, that AMD instantly snapped up. The lack of validation resources is directly responsible for the failures of many key Intel products during his tenure and later, because major bugs that could have been spotted earlier slipped through, and then resulted in horrible delays and even cancellations. He then spent the surplus of the company on 30 major acquisitions, of which only two were in any reasonable degree successful.
There are CEOs who have destroyed more value than Krzanich, but not many.
Before the 10nm issues, they were making consistent IPC improvement every generation, and although core counts were pretty stagnant for consumers, they would add a couple cores every generation on top Xeon skus. Maybe they could have done bigger changes with more time between, but it was nice being able to expect new server CPUs every 12-18 months that were meaningfully better.
I don't think their node problems were anywhere near that simple. You also left out the part where AMD moved to chiplets while intel stubbornly remained monolithic for quite a while. And a whole list of other missteps.
Intel stopped advancing in 2014-2015 for a long time. They flopped on the fabrication side, they stuck to the 2-4 core CPUs and charged an arm and a leg for anything with more than that. This gave AMD an opening with their cheap and yet still decently fast higher core count CPUs.