Lattice points in a circle for generic unimodular shears

Given a unimodular lattice $Λ\subseteq \mathbb{R}^2$ consider the counting function $\mathcal{N}_Λ(T)$ counting the number of lattice points of norm less than $T$, and the remainder $\mathcal{R}_Λ(T)=\mathcal{N}(T)-πT^2$. We give an elementary proof that the mean square of the remainder over the set of all shears of a unimodular lattice is bounded by $O(T\log^2(T))$.

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