Why do GRB observations of Lorentz invariance at circa 1 Pl exclude most quantum gravity theories?

10 October 2015 0 2K Report

In 2009 a paper published in Nature purported to refute most if not all quantum gravity theories which proposed a possible minor shift in Lorentz invariance.

The investigators found no invariance down to about Pl/1.2. However, given the uncertainties in the experimental method, that could easily have been Pl/1.

One would expect at least some quantum gravity theories to operate at that level of 1Pl.

Is there not a risk of excluding valid theories on the basis of one experiment

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