A first use of the ROM with the Bliss Launcher went without problems. The icons are too small for a 9.7 inch tablet for my eyes. Functionally everything is okay.
On recommendation of argon3030 I installed the OpenLauncher as the F-Droid Store. I like the bigger OpenLauncher icons optically better.
The BlissLauncher icons might look better on the 8.0 inches gts28vewifi. Unfortunately there are no official LineageOS ROMs for Galaxy Tab S2 with LTE and phone function.
For the Galaxy Tab S2 9.7 LTE SM-T815 an “unoffical” LOS 14.1 with security patches July 5, 2020, which has been maintained for years, is available.