I do believe this 'G-suit' thing to be a distraction here. Very rarely does formation aerobatic work REQUIRE a G-suit as the levels of 'g' are relatively low. In my time on the Arrows, 3-4 g was the maximum 'in-formation' g pulled, while obviously when 'let loose' after bomb-burst or during rejoins and opposition pair work the g was significantly higher. The main function of such a suit is to reduce the amount of fatigue a pilot experiences during a multi-sector day as less physical effort is required to counter the g-forces with a suit than without.
Even with a 'suit' (and NB I am NOT making any comment on the cause of this particular crash) it is easy to induce loss of consciousness if the manoeuvre is hard enough - and even with a suit, out you go.