in the introduction they explain that it's not possible "The first question everyone has about microcode updates is something like "So can I execute ARM64 code

in the introduction they explain that it's not possible "The first question everyone has about microcode updates is something like "So can I execute ARM64 code natively on my Athlon?" It's a fun idea, but now we know that a microcode patch doesn't work like that -- so the answer is no, sorry!"