The phrase "accurate rendering" means to depict or represent something in a truthful and precise way, without any mistakes or distortions. It refers to creating an exact and faithful portrayal or reproduction of something. Full definition
More accurate rendering of layouts to more faithfully reflect how the layout will look on devices, including rendering status and title bars to more accurately reflect screen space actually available to applications. (intomobile.com)
No, we have nothing to do with the leak but we did come out with accurate renderings of the new Range Rover Sport last year itself (renderings attached again for comparison below). (motorbeam.com)