Apparently, the MDH isn't valid, as we can we do a no DH approach. So why is it mentioned?
You can't do a NO DH approach, the figures on the top line are the lowest state or system installation minima.
Company specific authorisation is required from the state authority governing the airport to fly a CAT3 approach and those approved figures will be published on the CCI page which is company specific.
They may be higher than the minima on the top line of box but they won't, or shouldn't be, lower.
For instance the LIDO chart for Warsaw 33 shows 0-175R in the minima box so in theory the airport will allow a NO DH approach at not less that 175m but our company CCI page shows 200m and 50ft (CAT3A) so that is what we are authorised to fly and we can't go lower than that. T
The figures may have come from the authority or perhaps the company have decided that they don't want operate lower at that airport but whatever the reason those figures are the minimum you can operate to.