Told to me personally, by an FAA inspector ( a former USAAF Colonel), in the mid-1960's....
"When we operated C-54's during the Berlin Airlift, the GCA (PAR) approaches offered, allowed a nearly zero visibility landing...and I have made plenty where, after landing, I could not taxi, due to the reduced visibility'.
When I asked about the flare maneuver, he said...'when over the threshold, the radar controller mentioned "close the throttles and reduce the descent rate to zero."
Apparently it worked as advertised, as many aircraft did this type of radar approach.