I was going to say something flippant like, call it experimental and you can do what you like, but I didn't want to start any us and them banter or drift this even more off topic.
Looking at some of these pics (not necessarily the same as the mishap aircraft) it looks like they have dummy seats. I was wondering whether they even had chutes but this looks like a chute in the rear cockpit(?):
More pics here: (and some gucci kit up front too)
Warbird Depot - Trainers > Lee Leet's Short Tucano T Mk1