While DeoVR can indeed support 8K resolution, I think the real issue is the user interface of the DeoVR player. I'm sure @FromTheNewWorld isn't the only user who is confused by seeing the list of resolutions in DeoVR and trying to figure out which is 8K. Why not just label the different options as 4K, 6K, 7K, 8K? Or even better label it as 8K (8192x4096)
This is especially helpful since DeoVR is a platform that hosts immersive videos that have a wide range of aspect ratios. For example, I upload 8K stereoscopic 3D side-by-side video files that have a resolution of 7680x1600. The DeoVR player only lists this resolution as 1600 so most people won't think to click that to get the highest quality version.