I see. Makes sense. Particle physics is way out of my area of interest.
I suspect, however, that YECs who don't trust mainstream science will accuse scientists of having 'preconceptions' about particle physics and by not testing how these super high temperatures affect decay rates, they are making
a priori assumptions. Either that or the scientists are afraid their pet theories will go out the window.
It doesn't matter that when one understands how particle physics works, there is absolutely no reason to conduct such a test.
It'd be like asking a geologist to look for an evaporite in a layered intrusion.