I saw this earlier but since I can only see the main image and reading didn't net an answer - what, exactly are they measuring? I am not expert but to my unders

I saw this earlier but since I can only see the main image and reading didn't net an answer - what, exactly are they measuring? I am not expert but to my understand part of ryzen success is high yields due to small size. Having a thing 3x its size, while impressive, is not super surprising. Soon it will be 6x, then more. Zen 5 small cores are supposed to be just zen 4 cores iirc.