It's a mistake - according to journey planners the train still runs to Manchester. To have 4 services within 1 hour seems a bit much for Liverpool anyway!
Virgin have made a number of mistakes in their online timetables. (I don't know about the printed ones yet - I will pick them up from Euston this Saturday coming.)
For example, the 21:07 service to Liverpool is shown as running to Crewe only, and that customers must take a "connecting" service to Liverpool. The "connections" also have a "y" next to them, even though the "Notes" page doesn't even mention a "y"! (For the record, the train
does run to Liverpool direct.)
On the E/F timetable, the 06:16 service from Preston to Birmingham has Birmingham highlighted (to say that alighting customers will be served breakfast), even though the service terminates at Birmingham!

Wolverhampton is also highlighted, even though meals (or sandwiches) are never served to customers travelling between Wolverhampton and Birmingham.