1320 local = 1220Z, I think.
The LQSA minima you quote, again I think, are for Cat C aircraft and the 2250' refers to DA (Decision Altitude). The airfield elevation is about 1700', so a cloudbase of 550' is required and not 2250'
The nearest METARs you give are
LQSA 1200Z 00000KT 0700 R12/0300V0500U -SNRA FG SCT002 BKN010 OVC025 01/00 Q1011 NOSIG
and
LQSA 301300Z VRB01KT 1100 R12/0800V1100D -SNRA BR FEW002 BKN012 OVC025 01/00 Q1010 NOSIG
In both of these the cloudbase looks ok - the SCT002 wouldn't preclude an approach.
The RVR trend from 1200 to 1300 is upwards, so it could well be that the instantaneous RVR at 1220 would have been legal.