I followed the directions here and signed in to GameSpot and attempted to turn off video autoplay: https://www.gamespot.com/forums/bug-reporting-feedback-1000006/how-to-disable-video-autoplay-in-articles-33442137/
The toggle does not show up. I also tried in Private/Incognito mode and signed in under that, the toggle does not show up then either.
I tried this on desktop Firefox 63.0.3 64-bit, desktop Chrome 70.0.3538.110-1 64-bit, mobile Chrome 70.0.3538.110, mobile Firefox 63.0.3, all in normal mode while signed in, and also in private/incognito while signed in.
The toggle doesn't ever show up.