This version info is missing the Android version your /e/OS 0.23 is based on, but looking at what’s available for the S8 there seems to be no variety in that regard, all publicly available dreamlte builds are “p” = Pie = Android 9 (see Settings - About Phone - Android version).
0.23 was the last /e/OS version based on Android 9 and prior, update support was dropped after that (the Android 9 base wasn’t getting security updates from Google anymore for a while already before /e/OS followed suit), so the message your updater gives would be correct.
Since currently there don’t seem to be builds for manual install available based on newer Android versions for the S8, you can currently only wait and see whether the developers manage to finalise the announced OTA upgrade via the updater on the S8, you can follow proceedings here …https://community.e.foundation/tag/development-updates …
(S = Android 12)