Just cook the chicken at 600C for 10min

If it takes 20 minutes to bake them at 250 degrees, it should only take two minutes at 2500 degrees!

Forgive me, i can be a bit dense, but… is there a reason this wouldnt work? Would it just like flash boil and explode or something.

Because heat diffuse at a limited rate. More heat won’t magically make it faster. Increasing the heat will continue cooking an already heat soaked layer, unable to radiate that heat to the inner layer to fast enough. At best you’ll get an overcooked exterior, at worst a carbonized one. In both case, the inner layer will be barely warm, and raw, of course.