Variations on the story include F-BTSC passing within 7m, 70m or 7 yards(!) of the alleged Chirac 747, the alleged 747 itself either on the runway and exiting, at a holding point or *actually crossing the runway across F-BTSC's path*.
The pictures on page 92 of the BEA report were evidently shot from an aircraft on one of the S taxiways; going by the map on page 39 and looking at the perspective, probably S2. So there was an aircraft holding there that Concorde swung towards, whether or not Chirac was on board.