Citation2, I don't think you understand the difference between aircraft capability (e.g. indication on FMA), approach type and related minimum altitude for autopilot disconnect.
Airbus FCOM is actually quite clear on this topic (especially compared to some other French "tricks"). If FMA is showing CAT 1 capability, you should disconnect the autopilot at 160ft the latest. If you have CAT 2, CAT 3 SINGLE or CAT 3 DUAL and you plan a manual landing, you should disconnect it at 80ft. Of course, everything assumes an ILS approach - for NPA, limitations are different.
Minimum height for use of the autopilot in:
- ILS approach when CAT2 or CAT3 is not displayed on the FMA ...160 ft AGL
and
If the flight crew performs an automatic approach without autoland, the autopilot must be disengaged
no later than at 80 ft AGL.
There is no reason why you can't use autopilot on a normal Category I ILS approach until 80ft - provided FMA displays capability CAT 2 or better and aircraft remains in desired flight path of course.