I would argue that machine code is typed, but this will be up to interpretation. I.e. you can add two 32 but floating point numbers or two 16 bit integers or store an 8 bit value. It's just doesn't require you to purposefully type pun in some circumstances (e.g. where floating point and integer registers are shared).

A "typed" machine code would imply that you can say "Add these two 32-bit floating points" and the CPU will say "No, I can't, those are 4 8-bit unsigned integers". I don't believe the CPU will ever say that, so it is not typed by any sensible measure. Best you can do is that there may be some registers that can only be used by floating point units and others that can only be used by ints, but even that is really just hardware limitations for performance and not any sort of type assertion; the CPU will happily bit-slam them back and forth without anything like an "exception".