Now, as far as AndreaRu's post that you quoted. IDK where she is located so IDK the extensiveness or level of the skating center at which she goes. It may be in a small locale and not have high level coaches. Or perhaps it is and they have a great protocol, I'll let her answer that for you.
You're right that we don't have elite skaters at my rink and there are a lot more injuries at that level, but I'm operating under the assumption that OP's child will most likely be in the 95% of skaters who will not fall into that category. I don't think we can assess the risks to her particular skater by looking at injuries to elite skaters working on triples and quads. If you adjust the risk statistics to include only the vast majority of skaters (those working on doubles and below), then the level of risk drops like a rock. Understanding OP's distaste for the sport and her concern for the possible financial "ruin" it could cause, my assumption is that her son probably won't fall into the category of skaters working on the kinds of jumps that cause major injuries.