[jfengel]

They start with raw data collected at the event itself. A lot of games have statisticians who collect not just the scores but gather data on every play/at-bat/etc. Even high school games have those; it's often the official job of some student.

That does have enough information to make an article. In the early days of baseball, a radio announcer could receive the stats continuously and narrate the game, with a bit of imagination.

Some of the examples look as if they got nothing more than the box scores, and used AI hallucination on other sports articles to generate a bunch of generic verbiage out of that. (To me, as a non sports fan, that's what most sports writing looks like anyway. I have no idea why people want to read that, but there is a market for it.)