Looking at the European S23 Ultra (model: SM-S918B, sales code: EUX, version: S918BXXU1AWA6/S918BOXM1AWA6):
* The compressed firmware is 9.2 GiB.
* The total image size after decompression and desparsing is 12 GiB. I'm not sure why the device mentioned in the article would be reporting 60 GB, but I'm guessing it's counting some data in the userdata partition. Due to AVB's (Android Verified Boot) use of footers, the image size in the firmware package must match the actual partition size. So the 60 GB can't be the sum of all the read-only OS partitions.
* The biggest image is `super` -> `system` at 5.4 GiB.
* All of the images contained within the dm-linear `super` partition are formatted with the new erofs filesystem. I didn't know any devices shipped with that yet. Even the Pixel 7 series is still using ext4 for read-only partitions.
* The complete partition table and file list (after image extraction): https://gist.github.com/chenxiaolong/a4c70376f8e5ba0b4f41547...