Is he still competing and practicing quintuple jumps?? Is he injured? Are russian kids practicing those jumps with a harness and without the harness on the ice?? How old are the ones doing them? Will their quints be allowed in competitions in Russia and abroad along with triple jumps?? Are there now 6 year old little girls doing triple jumps with or without the harness in Russia and in other countries?
I understand the subtext of your post

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Figure skating is a dangerous sport and always has been. The female winner of Europeans had a broken leg this time last year (from jumping triples). Hendrickx out with a bad ankle requiring surgery, Levito out with a long term injury. Even skaters who have barely rotated triples have traumatic, long term injuries as you can see. I really don't think that extra rotation is the difference between this sport being safe and being traumatic. Lipinski was retired in her mid-teens requiring an immediate hip replacement. Adam Siao skates on a bad ankle (still slams on the ice with his backflip likely worsening it). I feel like people have another agenda when they talk about these jumps and suddenly show concern for the Russian juniors

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In terms of winter Olympic sports, luge, ski jump, snowboarding, ice hockey, alpine skiing are all much more dangerous, much higher injury rates. Are parents and coaches who enable children to participate in these sports immoral because there will be inevitable injury even deaths? High school football players have full contact, children playing rugby tackle each other, skateboarding and BMX are extremely dangerous summer Olympic sports for children, children participate in sports like motocross and other forms of motor racing.
Given that traumatic leg, hip, back injuries, concussions have always existed in figure skating from days of jumping doubles and triples (I just gave examples of skaters with triples who have traumatic, long term injuries), given this is a precision sport that requires years of training as a child to become successful as a senior, there is not an ethical way to conduct this sport if traumatic injury is someone's concern. Biellmann spins cause trauma to a skater's back, do we start banning them (probably makes sense than banning quads). Ban lifts in pairs? There is always ice dance and synchronised skating for skaters who want to participate in less traumatic forms of skating.
These are kind of rhetorical questions of course. I completely understand your post
I don't think any child or parent gets involved in figure skating thinking it's going to be as safe as ballroom dancing. Different people have different risk tolerances.
To lower injuries in figure skating, it would be better to look at improving boot technology, to mandate that the skaters wear safety equipment. It is pointless to talk about safety when they go out onto a rock hard surface wearing protected by a sheer piece of fabric.