If I implement my own CPU and include the original 68000 instruction set (as well as adding new ones) I am certainly not emulating it, but keeping compatibility with it.
Same thing with Intel CPUs that came after the 8088 (used in the first XT). They could all run 8088 code but included many new commands (I'm referring to 286/386/486 etc).
That's called being back-compatible, has nothing to do with emulation.
(Sorry for continuing the OT discussion)