The Fairphone 2 used to be stuck on the Android kernel 3.4.0 for its Android 5.1 - 7.1 updates. What kernel are the Android 9 and Android 10 (Fairphone OS 22.02.0) updates using?
You can find this info with this command in a terminal: uname -a
And just to add this info can be found in the settings-about the phone…
Edit: Kernel update is from last year
From beta Programm
For the upcoming Android 9 maintenance releases we are looking to update the kernel, from version 3.4.0 to version 3.4.113. Before doing so we want to subject the updated kernel to extended testing, in order to obtain sufficient data on stability, performance and reliability. Therefore we’ve updated the last official release (21.05.0-rel.1) to include the updated kernel.