On the msccruises.co.uk site it says:
Please note that All-Inclusive Beverage packages for Summer 2023 up to Summer 2024 cruises are detailed here below.
To know the details of Beverage packages for Winter 2022/23 cruises, please login your personal area.
and then list the new max prices 14euros/16$, so I'm guessing there's some type of changeover period and if its classed as a winter cruise 2022/23 your on the old max price, if its classed as a summer cruise then your on the new.
Which date this change will actually occur I am unsure of. And its really bad if your on a cruise where they have increased the individual price of the drinks but your on the old package.