@Dracul, at the moment, Arch ships 6.16.8 as the latest kernel and OpenZFS 2.3.4 is compatible with it, so this package covers this combination.
I don't know why the repo you've mentioned didn't update to 6.16.8. It might be just a glitch or perhaps they found some issues with this kernel/OpenZFS combination and decided not to update. It would be best to ask them rather then guess.
Edit: this was the issue: https://github.com/archzfs/archzfs/issues/604
Pinned Comments
lightdot commented on 2025-02-04 21:19 (UTC) (edited on 2025-08-27 08:58 (UTC) by lightdot)
This package will be kept in sync with the latest openzfs stable release and the kernels officially supported by it.
For the supported kernel versions, refer to the respective openzfs release notes (LINK).
E.g., openzfs 2.3.4 supports kernel versions 4.18 - 6.16. When kernel 6.17 is released for Arch, zfs-linux will not be updated until the openzfs project announces that it's compatible. This will most likely happen with the next openzfs release.
Kernel compatibility of the upcoming openzfs release can be seen in their META file (LINK).
For those wishing to use openzfs with unsupported kernels, do note that this can lead to serious issues, including data loss, even though such a zfs-linux package might build and install cleanly. Have reliable backups and use such a package at your peril.
Please do not mark this package as out of date without checking the kernel compatibility first. Thank you!