TO, to answer your questions;
1. Although there are several systems including GPWS, Auto slow speed recovery (anti-departure) and a disorientaion recovery facilty (think auto-UP recovery), only the latter two are linked to the Flight Controls. In short, there is nothing to monitor or counter the effects of g-loc ala F16. Likewise, ASLR/DRF don’t use GPWS to prevent the jet flying into the ground when ‘she’ is in control.
2. Despite being a high performance jet, mishandling will still result in CFIT. In this particular case, nose low at high speed would quickly see the g-limit being the limiting factor not alpha. The acceleration of the jet in reheat, aided further by ‘gods g’, will only see the turn radius increase despite being at maximum g.
In short, if fighting single circle with terra firma, then fly at min radius speed; a speed much less than that assessed in this event.