It was showing the latest item from each game's news feed. Publishers are free to show whatever there, some show patch notes, in-game events and some use them to promote DLCs/sequels/related media. Some of these are "ad" like.

Knowing what a mess development is, especially games development, it's fairly easy to imagine this being an unfortunate incident where there wasn't proper integration testing done which might have caught this. There's no obvious benefit to showing years-old patch notes for games, so it seems pretty clearly unintended.