Absolutely, if Intel hadn’t been sleeping on their laurels for 5 years on desktop performance, and had made 6 and 8 core CPUs themselves before Ryzen arrived. Ryzen would not have been nearly as successful. This was followed by the catastrophic Intel 10nm fab failures, allowing AMD to stay ahead even longer.
So absolutely, AMD has been helped a lot by Intel failing to react in time, and then failing in execution when they did react.
Still I think congratulation is in order, because Ryzen was such a huge improvement on the desktop and server, that they absolutely deserve their success. Threadripper was icing on the cake, and completely trashed Intel in the workstation segment.
And AMD exposed Intel’s weakness in face of real competition. Arm and Nvidia had already done that in their respective areas, but AMD did it on Intel’s core business.
Yes this too is really a turnaround compared to “old times”. Intel used to be the safe choice, that’s definitely not the case anymore.