  A Lorentz-noninvariant modification of the kinematic dispersion law was
proposed in [hep-th/0211237], claimed to be derivable from from q-deformed
noncommutative theory, and argued to evade ultrahigh energy threshold anomalies
(trans-GKZ-cutoff cosmic rays and TeV-photons) by raising the respective
thresholds. It is pointed out that such dispersion laws do not follow from
deformed oscillator systems, and the proposed dispersion law is invalidated by
tachyonic propagation, as well as photon instability, in addition to the
process considered.
