There are several ways for us to retrieve hardware stats from the gpu. We're checking availability of these systems on the current system in order of our preference. In v6 we had NVidia's proprietary API incorporated as one possible source for this information. However using this api resulted in crashes which NVidia was unable to solve, so we stopped using it. As a result we're now using fallbacks that have to be provided by the OpenGL driver. If a driver doesn't provide an implementation we cannot show the stats.
We know the stats are available somewhere, we just haven't found a way to bring them back in yet
For now your best bet is Windows 10's Task Manager for high-level information or GPU-z for low-level information.