It sounds like an airline SOP rather than an airbus FCOM update.
Having said that, my airline has a vague "practice using reverse thrust at intervals" comment while our standard use is for idle only. My personal procedure to fulfil that SOP, and to avoid "locked in syndrome" on idle reverse only, is to select full reverse
any time I touch down with precipitation actually falling.
I figure that the one day I really need reverse will probably be a landing during a rain shower or the like, so I know that I will have "automatically" have it already deployed before I realise I need it
