Thanks mr angry, understood.
Either of the 'get outs' you mention - half roll off the top or unload & accelerate if far too slow etc., would work for me in my simple aeroplanes, and I have practiced them, being well used to my somewhat variable aerobatic ability! (In my case the unload and accelerate option would be more because a possible flick into an inverted spin would be more exciting than I'd like...)
It simply seemed unusual not to have practiced them in this came hence my speculation about mindset. I suppose cost or flying hours availability might be an issue, since the report seems to describe a very abbreviated conversion to type and to a Hunter aerobatic routine. If you don't think you need to trial any actual get out effort, this would not be a concern.