to be fair, that's 2 MiB code that is the base of the other os you never heard of, the IME, AMT and their backdoor capabilities [1]
1: https://fsf.org/blogs/community/active-management-technology
No, that's just the CPU µcode. IME/AMT are part of the BIOS/EFI images, which is a whopping 16 MiB for my current motherboard.
The current CPU microcode download appears to be 0.81 MB compressed for every single Intel CPU since the Pentium 4.
(Meanwhile, current Intel processors have 2 MiB microcode files.)