SPHLC,
Q1. Is the seat pan handle linkage levers or cables? (You can't push a simple cable)
Q2. Does pushing the handle back into the housing reset the mechanism
Q3. Did this individual report this incident
From my Hawk recollections;
A1. Yes. The handle is linkages rather than a cable, but the first tiny bit of pull is to remove the handle from the housing rather than start actuating the linkage. You can push it back in. We used to have to do it on the training seats when taking new students for seat briefs etc.
A2. Yes, effectively, as the mechanism's not been triggered. In reality, I doubt anyone would actually reset the seat themselves. Certainly in my time sitting on Mk10s and their equivalents, if you noticed an issue with the seat like this, you'd have an armourer meet you on the line to make the seat safe for maintenance before you unstrapped.
A3. Yes; I remember the HFOR or whatever it was at the time.