In article .com,
wrote:

I looked at the weather history on Weather Underground and PVD reported
visibilities in the 0.1 and 0.2 range around midnight that night, below
the standard ILS minimums for PVD. The Cat II and Cat III approaches
(both to ry 5) are not authorized when the tower is not in operation
according to the U.S. Terminal Procedures for PVD.

There's your answer. If the tower is closed, there's no-one to issue
RVR reports; the ASOS won't do it. Further, the charts specifically
say that Cat II (and III) minimums are NA when the tower is closed.

With no operating tower, they require Cat I minimums, which are 1/2
mile for both 05 and 23.

So what they said was true: They couldn't land because there was no-one
in the tower. Who knows how thorough the pilot's explanation was? I
fly regularly and see people who can't figure out how a seatbelt works,
so I don't think he's going to give a dissertation on visibility versus
RVR.