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We present simple arguments suggesting that H. Biss et al [PRL 128, 100401(2022)] did not measure with the required accuracy the low-wavenumber curvatureof the acoustic excitation branch of the ground-state unitary Fermi gas. Thisdifficult-to-calculate quantity is crucial for the relaxation dynamics of thegas at low temperature.

Comment on "Excitation Spectrum and Superfluid Gap of an Ultracold Fermi Gas"