The lower dosage only started being a thing once the spike in myocarditis was becoming too apparent to deny. Under 18's were eligible for a time to get the full dosage, before they scaled it down. If I remember correctly, Ernesto Ramirez was one of those kids that took a full dose. But yes, you are correct. I still don't think any amount of this vaccine is work the risk for under 18's with no serious health issues.

Edit- wow, on a stale thread, my comment was immediately downvoted within seconds of being posted. Is someone using a bot with their account?