Ah, yes. The “let’s bloat our game size to bully other games off your SSD so you’ll be reluctant to ever uninstall it, because reinstalling it would be a big pain, that way you’ll play it indefinitely and give us extra money in micro transactions” strategy.
Jpegxl. Also most of the filesize is gonna be the direct draw surface files .DDS, which are GPU decompressable meaning they’re about 25 times bigger than something properly compressed like .jxl, and that’s just with lossless compression. I tried writing a script for a few games to compress them using this and it made them massively smaller but also takes a while to decompress so there’s an intermediate that needs to be found (which I’m looking into).
The game is probably using DirectStorage, they can’t use JpegXL.