You are making a lot of uncharitable judgements in your post.
You made a comment that the OP’s confirmation was a charade? I don’t believe that is what he said. You are burdening his post with things he never said.
I made my confirmation when I was in 6th grade. The Church chose that age, not my parents, so you can just drop that thinking from your future arguments.
Just because the people you made your confirmation don’t go to church anymore (though I myself don’t keep track of who attends mass or not from my class) doesn’t mean they weren’t capable of understanding confirmation at the time. You can only speak for yourself. They may have other reasons on their faith journey why they fail to attend mass.
By the way, confirmation is not indoctrination.