The discussion shouldn’t be whether it is possible to land triples or quads if you are higher than average weight for a figure skater, but what’s the long term impact on your health, especially your knees and hips. If landing a jump means impact on your joints that is four times of your weight (and that’s when the jump is landed well, if it is not landed well, it is six times of your weight!), imagine how bad for your joints is any extra kilo you may have. An elite skater would do numerous jumps every day in practice, and not all of them will be landed well.
I am not promoting bullying anyone to lose weight, or anyone being ‘pushed’ into eating disorders, but there is a reason why the sport promotes slimmer skaters. The reason is not aesthetic, and it is not that it would be impossible to land the jumps while being heavier. The reason is that being slimmer is less damaging to the skater’s body.