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Yes ... which leads where? Those teenagers probably wouldn't have got Swine Flu if they'd just done nothing. So it probably leads to the conclusion that if the vaccines have similar effects to being exposed to the virus itself, that's not obviously a win?

The whole point of vaccines is that they are much better than getting the virus itself, and for the classical vaccines that established the reputation of the technique, that's definitely the case. For cases like swine flu and now it seems maybe COVID, it's not at all clear that the vaccines are universally preferable to the disease, especially for the young. For one, COVID is mostly not dangerous to people under the age of 65 or so. For another, the symptoms are often mild. And the symptoms of the vaccine are often quite intense. mRNA vaccines create the same kind of cell death as the disease itself, they aren't just presenting the immune system with inactivated virus and letting it target practice on the vaccine particles: they turn the bodies own cells into target practice. That's a fundamental difference in approach.

When it gets into these sorts of grey zones of a vaccine with strong side effects and a not very deadly virus (for certain risk groups), a repeat of the Pandemrix disaster is not out of the realm of possibility.