Comment on: Thermodynamic determination of the equilibrium first-order phase-transition line hidden by hysteresis

This is a Comment on: Thermodynamic determination of the equilibrium first-order phase-transition line hidden by hysteresis, published in Sci Rep 13, 6876 (2023); arXiv:2303.00327, by K. Matsuura et al. We stress that the lower hysteresis line should not be used to infer any thermodynamic quantity below the temperature at which the lower hysteresis line shows a maximum.