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In arxiv: 2102.05575 a two-step process $pn \to (pp) \pi^- \to (\Delta N)\pi^- \to (d \pi^+) \pi^-$ was calculated by using experimental total crosssections for the single-pion production processes $pn \to pp \pi^-(I=0)$ and$pp \to d \pi^+$. As a result the authors obtain a resonance-like structure forthe total $pn \to d\pi^+\pi^-$ cross section of about the right size and widthof the observed $d^*(2380)$ peak at an energy about 40 MeV below the$d^*(2380)$ mass. We object both the results of the sequential processcalculation and its presentation as an alternative to the dibaryoninterpretation.

Comment on "Sequential Single-Pion Production Explaining the Dibaryon "$d^*(2380)$" Peak"