Conjecture on the $(\operatorname{asc},\operatorname{RLmin})$ distribution for 021-avoiding ascent sequences

Let ${\mathcal S}_{021}(n)$ be the set of ascent sequences of length $n$ avoiding $021$, and let $\operatorname{asc}$ and $\operatorname{RLmin}$ denote, respectively, the number of ascents and right-to-left minima. The 021 bistatistic conjecture. The bistatistic $(\operatorname{asc},\operatorname{RLmin})$ has the same distribution on ${\mathcal S}_{021}(n)$ as on the 132-avoiding permutations of length $n$. The source subsequently reports that Bruce Sagan proved this conjecture in personal communication.