Firstly, the metabolism of glucose - and any other intracellular component, for that matter - is regulated via multiple feedback loops that prevent this "disaster" from happening. ATP-mediated metabolism (metabolism of glucose in the presence of oxygen), also known as Krebs' cycle, is extremely hard to destabilize like that. This is something perfected within mitochondria, which by themselves are primitive cellular organisms that managed to live in much harsher conditions that a mere cellphone -type radiation exposure for 30 minutes.
Secondly, 30-some minutes maybe have showed a slight imbalance, but did not show all these feedback loops kicking in and restoring the homeostasis of that cycle. After all, if it was that easy to perturb it, all life forms that depend on it would have disappeared already, due to natural selection (we're talking all oxygen-consuming organisms, from aerobic bacteria to humans). Not the case. Or is the author of the study imagining that Earth is/was not bathed in radiation during it's history?
Thirdly, the mere existence of this metabolic pathway as a central cycle in the whole metabolic picture that makes us tick is living proof of it's resilience; all other variants have been eliminated via natural selection (with the exception of anaerobic bacteria that only thrived in oxygen-depleted environments, essentially alien enclaves for this oxygen-rich planet).
Fourthly, mayne92 has a point: the study is so underpowered and poorly designed, any half-baked scientist would dismiss it in a heartbeat.