yes, zen4 is the ryzen 7xxx ans onwards. I think they will change the naming scheme again after the 9xxxs now though.

In my case my 5xxx cpu shows avx2 (256bit) in /proc/cpuinfo, I assume you will find avx512 there if you have it.

Also apparently there are mobile and server cpus with 7xxx names that are zen3. It is a mess certainly.

Affected CPUs: AVX-512 capable CPUs. Intel Xeon, Zen 4 AMD Ryzen and EPYC and up.
Affected function: UYVY to YUV422 format conversion (pixel-level color encoding).
Speedup: 18/10.98 = 1.64x (Since all AVX512 cpus should support and previously have used avx2(56)).

Apparently as part of an ongoing series of rewrites, they made a color encoding conversion function run 64% faster on server CPUs and somewhat recent AMD CPUs

The first day of the naturally occuring spring, occuring naturally at a set number of days after the solstice.
You can recognize it from the skybox changing color.

If that is true, how does the brain work?

Call everything you have ever experienced the finite dataset.
Constructing your brain from dna works in a timely manner.
Then training it does too, you get visibly smarter with time, so on a linear scale.