You're right there, Dick.
But it applies at any time, if you lose the required visual reference (or screw up the flare for some other reason) you make a missed approach. In this situation, though you are better prepared for it.
A point to bear in mind is the actual conditions which are prevailing.
So on checking in with ATC you say you've got their ATIS and they tell you what the RVR is right now.
Then they ask you what your minimum is and clear you for the approach.
You tell them "550" for example, and the next you hear from them is, "RVR 550, 600, 550. Call beacon inbound."
When you call you've passed the OM and are legal to continue to minimum anyway.