Makes me wonder if they even know what false and falsiafiable means.
In regards to the topic, I would argue for numerous smaller positive evidences that may tip TOE out of its position. For example, one thing that could help theological creationism would be demonstrated rapid phenotypical modifaction of higher order animals and plants. If they could find a mechanism that would support TOE, but by the same token it would bring 'creationism' closer to reach. At that point they'd have a mechanism that could support the hypermacroevolution of 'kinds'.
Or if they could generate a physical model of the earth that wouldn't kill everything on the planet for the flood, and they could still have a flood. Also if we could figure out where those flood waters disappeared to that would be nice to.
Or if they have positive demonstration of natural processes that disrupt geological layers without leaving any traces of disruption that would be another one (or methods to date it). This would bring to question the validity of dating any of the rocks because there would be no reliable way to test how old the rocks are, via superposition or anything. Like if they could demonstrate that methods for dating rocks are completely wrong and if they could generate a more accurate method or the correct method.
Or maybe if they could calculuate the heat of formation of the earth, now that one would be interesting, because then they'd have to figure out how long it would take for the earth to cool down, and bleed out the heat so that its cool enough to even support life.