At the end of my ATCO Cadet Course, we did a 2 week course with BEA at Viking House to familiarise us with Tridents. We were briefed that it was normal to engage reverse thrust about 10ft agl, and also that you didn't actually 'flare' to reduce rate of descent. We were told what happened was as the wing came into ground effect, it caused the nose to pitch down, and the so-called flare was actually to keep angle of attack constant until touchdown.
The bit I've put in italics was true for Concorde. Are you sure it's not
that aeroplane you are thinking of?