I find this statement inaccurate at best and misleading at worst.
things are happening, and whilst I believe BA is doing to tps what it intended originally, in other areas, specifically finance, there is a term for implied t&cs where even if rules stipulate otherwise, if the company has been doing something different to greater benefit of customer it can’t just change to align to letter of t&cs (eg on a way it charges credit card interest for months that are not fully paid off)