Can you please enlighten us further?
I might be wrong...
The ATC asserts to the same portal, that:
"W nocy nad lotniskiem była mgła, ale widoczność pozwalała na lądowanie."
"There was fog over the airfield that night, but visibility was sufficient for landing"
Would you land CAT I by such METAR ?
EPKT 280200Z VRB02KT 0300 R27/0500 R09/0600 FG BKN001 08/08 Q1027