Although the article has a quote from an 'insider' that reads: “If a child decides they are trans and tells the group instructor then that instructor is not allowed to tell their parents.”, this is probably the most concerning aspect of the article for me.
That's actually the law.
Many children come from homes and backgrounds where being known to be gay or trans would lead to physical, let alone mental abuse. I personally know one trans girl who got thrown out of her home and ended up on the streets until a charity took her in - same thing happens to many others when they are "outed".
Parents don't own children and don't always know best. If a child shares such information in confidence the recipient, whether a teacher or a cadet instructor, is obliged not to inform anyone apart from the appropriately trained safeguarding officials in the chain of organisation. They are protected under both privacy and GDPR regulations.*
Those who have broken that rule have been sacked for gross misconduct and the punishment upheld in employment tribunal judgements.
*See section 8.
https://tinyurl.com/ycyd5ymr