RVR is the only factor but the crew must not go below the DH unless sufficient visual clues are evident at DH.
Correct. And here for some reason the crew descended below G.S. not one half of the scale, but 3 full scales of G.S. indicator (i.e. more then 10 dots low !!).
This crew obviously found the runway otherwise they would not have been able to land and taxi to the gate.
Yes they did. But before that they confused the RWY lights with APP Lights