As MrSaffron has said VDSL Multicast is an additional service available to those already on VDSL lines to allow one-to-many data transmission of IP streaming content such as tv and media.
Snipit from Openreach's factsheets:
Multicast is one-to-many data transmission using the network infrastructure efficiently by sending source data only once, irrespective of the number of end users it needs to go to.
The nodes in the network take care of replicating the data to reach multiple receivers only when necessary, avoiding sending duplicate streams across the network to the NGA handover locations.
However as the BTW broadband service DB is showing that VDSL Multicast is available may be a hint that Cabinet 2 is RFS in regards to offering a FTTC/VDSLx service.
Just checking a property on that cabinet it is showing that Cab 2 on DORNIE exchange is now able to offer a FTTC/VDSLx service. It may be that the BTW database is still updating the records.