at, #274, (as I assume you know) accidents or near misses are rarely a simple issue.
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The crew expected visual conditions, they elected to fly a RNAV NPA. Unknown to them, and as explained in the report, the wx vis reduced below minimums (new, but unannounced ATIS).
The assumptions (and hazards) in NPAs are that the final approach will be completed visually, requiring contact with the airport environment, that the content of a visual scene is sufficient to determine position, and manoeuvre vertically and laterally towards the runway.
references for the intended runway is distinctly visible and identifiable to the pilot: