Yes, it does. It always renders internally at 2x which means that's all applications have to support. Then it downsamples the final framebuffer to the resolution of the display.
There is zero point in sampling higher than 48khz. That captures all frequencies up to 20khz or so. 192khz is just a waste of bandwidth for no actual gain.
On the flip side I built a PC back in 2016 (with two SSD's) which went into storage about 6 months later. I just got that PC back this year and it booted up just fine with all the data intact.