They made it up to avoid publicizing the level to which they can track cell phones.
All they did was extract whose cell phone was near that location and cross reference violent criminals.
They don’t want people to know this so they made up a fanciful story about a crust of pizza.
Many many crimes can be solved by simply tracking phones. That’s what policing is these days. The complex ones go unsolved because perps throw their phones away.
Shhhhhh...don’t tell them.
Seriously, I didn’t even think of that.