Few comments upon Gonzalez-Fernandez and Camacho paper (arXiv: 1904.02299) are pointed out. We bring evidences that the analogue gravity recipe does not work for a BEC in an anisotropic harmonic-oscillator trap. The analogy with an accelerated observer does not seem to be realistic. Some loopholes related to the physical units are emphasized.Most textbooks on Statistical Mechanics treat the phenomenon of Bose-Einstein condensate (BEC) in an uniform, non-interacting gas of bosons. In the semi-classical approximation, the energy spectrum is considered as a continuum. In the fully-condensed state, all bosons are in the same single-particle state [1].Gonzalez-Fernandez and Camacho [2] use the Analogue Gravity recipe in a study on moving fluids and an analog spacetime based on the acoustics of the fluid. The BEC is trapped in an anisotropic 3-dimensional harmonic-oscillator potential. In the acoustic representation, the authors' effective metric g µν (t, r) (their Eq.4) contains the prefactor n c /mc s , where c s is the phonons speed in the medium, m is the mass of the particles of the BEC and n c is the density distribution.From authors' Gross-Pitaevskii equation ( 1) (or from their Eq.2) we notice that the coupling constant k(a), characterising the effective interaction between the particles, has units of energy × volume while n c is 1/(volume). Therefore, the prefactor n c /mc s from their Eq.4 has the dimension T M −1 L −4 ( T-time, M -mass, L -length) (see also Eq.13). But g µν -the metric tensor in General Relativity (GR) should be dimensionless or a length squared if we take the coordinates to be dimensionless. In either case, it turns out that the units are erronous, even though the authors use geometrical units (C = 1, where C is the velocity of light in vacuo). Having dimensions, we cannot absorb the prefactor in