Yes, avx512 shows up in cpuinfo, although with the spec consisting of many optional modules and not being a monolithic thing, each supported part will show up separately.
My 7800X3D has these avx512 flags:
avx512f avx512dq avx512ifma avx512cd avx512bw avx512vl avx512_bf16 avx512vbmi avx512_vbmi2 avx512_vnni avx512_bitalg avx512_vpopcntdq
Yes, avx512 shows up in cpuinfo, although with the spec consisting of many optional modules and not being a monolithic thing, each supported part will show up separately.
My 7800X3D has these avx512 flags:
avx512f avx512dq avx512ifma avx512cd avx512bw avx512vl avx512_bf16 avx512vbmi avx512_vbmi2 avx512_vnni avx512_bitalg avx512_vpopcntdq