In days of yore before DME was co-located with ILS localisers it was indeed important to capture the G/S from below to avoid the other lobes however in modern times with the DME available almost everywhere, the odds of being "caught out" have been much reduced however we all know of places where ATC routinely conspire to force a capture from above.
This incident has all the signs of a crew not following the Airbus Golden Rule of "know and read your FMAs!"
Mind you it was Air France................................only saying!