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(2024) measured the derivative of the phase $\\phi_{\\mathrm{w}}$ of the Galactic warp traced by classical Cepheids with respect to their age $\\tau$ and interpreted it as the warp precession rate $\\omega\\equiv\\mathrm{d}\\phi_{\\mathrm{w}}/\\mathrm{d}t=-\\mathrm{d}\\phi_{\\mathrm{w}}/\\mathrm{d}\\tau$. This interpretation is unfounded: young stars follow trajectories close to those of their parental gas and trace the instantaneous gas warp, not its shape at their time of birth: $\\phi_{\\mathrm{w}}$ should hardly depend on Cepheid age. 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