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I point out that the cutoff introduced by Agullo et al.[Phys.Rev.D80:047503,2009 arXiv:0906.5315] has little impact on thetrans-Planckian problem as it is usually understood; it excludes only a smallfraction of the problematic modes.

Comment on "Insensitivity of Hawking Radiation to an invariant Planck-scale cutoff"