A Liouville-type theorem for cylindrical cones

Suppose that $\mathbf{C}_0^n \subset \mathbb{R}^{n+1}$ is a smooth strictly minimizing and strictly stable minimal hypercone, $l \geq 0$, and $M$ a complete embedded minimal hypersurface of $\mathbb{R}^{n+1+l}$ lying to one side of $\mathbf{C} = \mathbf{C}_0 \times \mathbb{R}^l$. If the density at infinity of $M$ is less than twice the density of $\mathbf{C}$, then we show that $M = H(\lambda) \times \mathbb{R}^l$, where $\{H(\lambda)\}_\lambda$ is the Hardt-Simon foliation of $\mathbf{C}_0$. This extends a result of L. Simon, where an additional smallness assumption is required for the normal vector of $M$.