It does mean they're covering maybe 60-70% of the UK's market (where this pan is sold) - gas use is very prevalent in the UK due to historically having being cheaper than electricity.
I don't see where it looks like there are fins on the inside, and I disagree with your insistence below that it must for heat-transfer reasons - the fins are (relatively) thin, so I'd estimate no point on the inside of the circumference would be several centimetres from the [hot air]. Besides, part of the point of the fins is that they capture heat from the air. Without any math required, if the fin is a reasonable conductor, this means the air is hotter than the fin, which is hotter than the inside of the pan. Where fins join the pan there's a large surface area capturing heat from the air going to a smaller area of pan, compared to gaps between fins where the area in contact with the air is approximately equal to the area of inside pan.
edit:
[Disclosure] Dr Povey was one of my tutors, and the bearded fellow with glasses in the video was a peer at college (six engineers in my year).
I don't see where it looks like there are fins on the inside, and I disagree with your insistence below that it must for heat-transfer reasons - the fins are (relatively) thin, so I'd estimate no point on the inside of the circumference would be several centimetres from the [hot air]. Besides, part of the point of the fins is that they capture heat from the air. Without any math required, if the fin is a reasonable conductor, this means the air is hotter than the fin, which is hotter than the inside of the pan. Where fins join the pan there's a large surface area capturing heat from the air going to a smaller area of pan, compared to gaps between fins where the area in contact with the air is approximately equal to the area of inside pan.
edit: [Disclosure] Dr Povey was one of my tutors, and the bearded fellow with glasses in the video was a peer at college (six engineers in my year).