Is your bar seriously advertising? The mental gymnastics going on here is crazy. Yes it’s a true scotsman fallacy. It doesn’t matter if someone born in Scotland calls themselves Scottish or not, legally speaking they are still Scottish. That’s how that works.
A child might not bother with the terminal on Linux Mint either. Does that mean Linux Mint isn’t a real Linux now?
You also severely underestimate what children are capable of. I installed my first Linux distro, and taught myself HTML and CSS while still in primary school. I don’t think you have any idea what children can do. I could probably outclass most adults with technology when I was 16 or so.