Can anyone shed some light on which parts of the Mennens versus Emirates judgement is applicable here?

Item 27 of this judgement states: “Where, as in a situation such as that at issue in the main proceedings, an air carrier places a passenger in a class lower than that for which he purchased his ticket, on a given flight, the inconvenience caused to that passenger derives from the fact that he does not benefit, during that flight, from the comfort corresponding to the class indicated in that ticket.”

So for those of us who have been rebooked/repriced/reticketed by BA following a cabin closure x months ahead of the departure date, where exactly do we stand?