  Huang et al. (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. We show that the measured $\mathrm{d}\phi_{\mathrm{w}}/\mathrm{d}\tau>0$
is consistent with an omitted-variable bias from neglecting the natural twist
$\mathrm{d}\phi_{\mathrm{w}}/\mathrm{d}R$ of the warp and the $R$-$\tau$
correlation for Cepheids (originating from the Galactic metallicity gradient
and the Cepheid metallicity-age correlation).
