  \Kepler\ planets around a given star have similar sizes to each other and
regular orbital spacing, like "peas in a pod." Several studies have tested
whether detection bias could produce this apparent pattern by resampling planet
radii at random and applying a sensitivity function analogous to that of the
Kepler spacecraft. However, \citet{Zhu2019} argues that this pattern is not
astrophysical but an artifact of Kepler's discovery efficiency at the detection
threshold. To support this claim, their new analysis samples the transit
signal-to-noise ratio (SNR) to derive a synthetic population of bootstrapped
planet radii. Here, we examine the procedure of sampling transit SNR and
demonstrate it is not applicable. Sampling transit SNR does not set up random,
independent planet radii, and so it is unsuitable for corroborating (or
falsifying) detection bias as the origin of apparent patterns in planet radius.
By sampling the planet radii directly and using a simple model for Kepler's
sensitivity, we rule out detection bias as the source of the peas-in-a-pod
pattern with $>10$-$\sigma$ confidence.
