Not necessarily.
Some true, and real, and veritable macro lenses come in a focussing mount.

As Dynachrome wrote only three posts up:
Olympus made 20mm and 38mm lenses in RMS mount and than made different versions in these same focal lengths but in OM mount and with auto diaphragms. In addition to these, Olympus made 80mm and 135mm bellows macro lenses in OM mount. They are [...]