Slightly different to a hold G. And thats not a NDB procedure as such it just uses one to get you onto the localiser. In the US they would just use the loc backcourse which we arn't allowed to use in the UK or G reg aircraft.
It is quite common for the NDB procedures to be DME linked and you also will get a lower MDA compared to a timed one.
Holds though only have one point and are timed. The 6.6DME FAF has nothing to do with the hold.