(this is my ignorant understanding of how CPU sizing works)

Process size isn't the end-all be-all stat to follow for CPU manufacturing sizes. While Intel may not be leading here, they are leading when it comes to feature sizes.

https://www.extremetech.com/computing/246902-intel-claims-th...

The idea being of how large the features of the CPU are to make up the building block for parts of the system. While Intel's process may be larger, they end up getting smaller overall chips because they can still get more "Features" into a smaller area.

Also, Most CPUs aren't made at a single process size. They will mix 2-3 generations of process sizes when producing CPUs, and only put the hot-path parts of the CPU in the newest process size (to help improve yields).