That.. sounds like the literal opposite of what it shows, no?

I think you misunderstood. Had the pilots been trained, they could have dealt with it -- that the off-duty pilot was able to shows it was possible to respond correctly, while that the others weren't shows the lack of training is a real problem.

Thanks, I see. I don't think it does much good to notice that a small percentage of pilots can be capable of figuring it out, if they have no other duties at the time.

That doesn't tell us that it's reasonable to expect pilots in command under stress to always figure it out. And they have to figure it out 100% of the time to avoid statistically unacceptable crashes. So I don't agree that pilot training is an acceptable answer given what we know so far.

Yes it does: it shows that there is a procedure that would have worked had the pilots recognized the issue and known about the procedure.

The pilots were stressed in part because they didn't know -- they had plenty of time to recognize the issue and take action had they known, but they didn't, so no amount of time would have helped them. We don't know if one more thing to know about would too much, but I rather doubt that.