So may be the captain did see the runway and said continue.
Maybe, but somehow I don't agree with a change of PF JUST at minima under those conditions.
But still, being a NPA, the FO had a bit of time to make his discomfort known to the captain. If he never saw the runway or thought they were low or even better, to call a missed approach due to an unstabilised approach (+1000ft/min), he never did it, despite having enough time to do so.