Flatness conjecture for the naive symplectic local model

Let $\mathbf M^{\mathrm{naive}}_{GSp_{2g}}$ denote the naive local model for the symplectic similitude group $GSp_{2g}$ in the ramified setting considered in the paper. Flatness conjecture for the naive symplectic local model. The naive local model

$$\mathbf M^{\mathrm{naive}}_{GSp_{2g}}$$

is flat. The paper proves only that the corresponding symplectic local model is topologically flat and explicitly states that it cannot prove flatness for the relevant symplectic models, so this conjecture remains open in the supplied source.