What he has done is awesome. Yes, I misunderstood the title at first too, but that was more than made up by the care and attention put into building this app. Building things for your own kids just for the fun of it is what parents do.
The title of the the piece/submission would be well served by calling it a simulated radar. I, like I suspect many others, clicked on it because I was honestly intrigued by the concept of some sort of homebrew radar. Setting that bar and then seeing that it's some API results plotted on a simulated radar screen is a bit of a letdown.
Submission is clickbait. It's a cool project, sounds like fun and I'm sure their kid likes it, but the root post is not wrong.
I clicked because I was excited to see the story of their unexpected interaction with the FCC and FAA (or local equivalents) due to putting out that much EM radiation in those spectra. But no. Still cool, though.
Stop dunking on people having fun.