I'm sorry, but I can only confirm the flickering will appear when using products that creates custom camera views (es. Opus, EZdok) and this *might* be fixed on our side, not 100% sure because it might be a limitation of the FSX camera system, but if there's something that can be fixed, we can only fix it from our side.
AND, there will be flickering if you use Top-down view or other far-away views like tower view.
But if you are having flickering in standard VC or 2D views, and you have the Mesh settings and Complexity as indicated on the manual (note they should be at *that* setting of 5m/pixel not less, but even not more), then it's something caused by another scenery.