Wow, "bet they won't make that mistake again"? I agree others can learn from this, that's what the post is about. I found your comment insensitive.
So you think they'll make the same mistake again?

Or you just don't like someone pointing out the obvious?
My daughter has had two bad concussions. After the first one (skating on a pond), we took her to the ER on the way home, but we almost didn't because it was "out of the way". She had thrown up though, and said her head hurt, so we thought it would be better to be safe than sorry. Yes, she had a moderate concussion, had to wake her up every few hours, etc. But we almost didn't take her there, and when we heard the word 'moderate' we knew we had made the right choice.
A decade later, she got a second concussion playing rugby. My mother was driving her home from the game, (we did not attend) and called me to say that my daughter was complaining of a headache and she might have a concussion. I told my mom to drive her to the nearest ER, and my mom argued with me that she wanted to drive her home to me and then I could take her?!? Luckily she did go right to the ER, more serious concussion, with multiple follow-up appointments before shew as cleared to play again.
So, yes, I agree, the parents won't make that mistake again, and I'm glad your nephew is doing better. I hope he makes a full, rapid recovery.