Having posted the question, and now read the ANO, it seems to me the most likely interpretation is that BOTH the recommended height addition to the minimum for IMC rated pilots AND the absolute minimum for IMC rated pilots are recommendations, but it would be legal for an IMC rated pilot to operate to the same minimum as an IR holder. In addition it would seem IMC rated pilots need to be aware of an RVR minimum of 1800m, somewhat higher than that for an IR holder.
Commonsense may well dictate otherwise, but my impression is that very many IMC holders believe their legal privileges are different from IR holders.