That was easy to find: http://www.cisco.com/c/en/us/products/collateral/collaboration-endpoints/unified-ip-phone-6901/data_sheet_c78-584412.html
(2nd phone on the list you provided), so its clearly not EOL.
We never used CUCM, but we did switch from a very legacy, very antique phone system to fPBX because well, the old system didn’t even offer time groups, IVRs, or CDR data… basically, it was an extremely expensive pile of crap that was good probably 15 years ago.
That being said, I am pushing to get away from SCCP phones and into Grandstreams.