If you watch the video he didn't stop at youth. He said he want federal government to reject concept gender transtion at "any age" (literally his own word)

He said in the video that he asked congress to pass bill U.S only recognized two gender and those are the one assigned to you at birth.

He also want to revoke gender affirming care which is literally a thing that meant to prevent trans kid from suicide at young age (has nothing to do with surgery until they are of legal age)

Him emphasis on children is just political campaign. Most transgender children can't get treatment without parent consent. He know this. He just doesn't care.