Perhaps it is misleading, but at it's current state it sayss 'Subject to...' which so far to me says unless different it aint coming. I suspect the ELR haven't had time to update the site, and perhaps it was withdrawn late from the roster.
Unfortunately 55022 didn't run ue to her bodywork overhaul still being completed at Barrow Hill.
The ELR Diesel site is independent of the official ELR one, and is updated as and when time permits by its webmaster. The rosters are usually planned, but in the case of a non appearence, a loco of the same breed ( I.e if an EE loco is promised, an EE loco will run ) will appear instead.