Many manufacturers increase the MGW of their aircraft once in service, the 139 is a good example.
Unless there are modifications to the aircraft to achieve that, I think it will just be evidence provided by Airbus that it can still meet its certification criteria heavier than it was originally certified (Cat A/PC1 profiles for example).
It could require a software upgrade to the Helionix system to update performance figures, I don't know.
It should appear as a supplement in the RFM.