Minimal W-algebras of ${\mathfrak{s}\mathfrak{o}}_N$ at level minus one

For $N\in {\mathbb{Z}}_{\ge 7}$ we show that the simple minimal $\mathcal{W}$-algebra of ${\mathfrak{s}\mathfrak{o}}_N$ at level minus one is isomorphic to the even subalgebra of the tensor product of the simple affine vertex superalgebra of ${\mathfrak{o}\mathfrak{s}\mathfrak{p}}_{1\mathrm{\mid }2}$ at level $\frac{N-6}{2}$ with $N-4$ free fermions. In particular when $N$ is even this minimal $\mathcal{W}$-algebra is strongly rational as conjectured by Arakawa-Moreau.