The gotcha pin-in-SFH-out (position 2 in the SI) was not only known about, but highlighted and emphasised to us at each and every briefing.
Camlobe, thanks for posting that. There must be many lurkers reading this thread who have the same recollections as well. I'm astounded that it is being presented as new info by the SI. (or am I reading it wrongly? - no: "testing established that the SFH could be positioned in a number of locations...")
Pilots will recall the dummy seat in the ground school classroom where one could practise strapping in, making the seat live/safe and pulling the handle, (and re-setting it afterwards) so all Hawk pilots will have had a go at that.