I've had a reply from the Executive Club customer service team that my flights, assuming they get flown as ticketed, would qualify. On paper, there seems that there could be some provision for BA to refute the match extension, as I seemingly do not comply, but, I have it in writing that they'll honor it, so I'm good with that! All I'd suggest is before you all go flying, make sure you have some good confidence yours will be honored too. It'd be pretty unfortunate to book the flights, travel, and then learn after the fact some technicality restricts you being able to enjoy the status match ongoing!