The flex is probably because they are 15 and a bit immature.

An anecdote - I used to be the lead for an infotainment security program for a well known manufacturer. They would send me to a lot of small security meetups and training. One in specific was a security training event for some HS students, which I would define as gifted. There were roughly 40 of them, from 14 to 17 years old, and they were all extremely impressive in things ranging from reverse engineering applications to assembly code all the way Linux systems stuff.

Something like this would have been easy for them - I mean the basics of this is that the attacker sends a message to a discord/signal user and then sends a request to a Cloudfare server. Not exactly splitting atoms IMO. What I think is special about this 15 year old in question is the epiphany that it might be possible and then giving it a go. This is the true hacker spirit.