The present QGEFT implementation produces a redshift-dependent Lorentz-violation curve that remains below all five conservative Fermi-LAT GRB upper limits tested here (`excluded = 0/5`). The strongest current benchmark is GRB090510A, for which the predicted delay remains below the observed upper bound by a factor of about `6. 83`, while the early-universe branch predicts a distinctive high-redshift plateau produced by `gc 1` and `ₐ₆₄₅ₓ 0`.
Yaniv Cohen (Sat,) studied this question.