This is a bit redundant on devices that have a headphone port in addition to USB-C. They've been pretty quiet about supporting this mode if they do support it. If Apple supports this then I would not be surprised. The audio adapter accessory mode was added to the USB-C spec in 2017, this is a mode that allows for analog audio over USB-C. A VirtualLink GPU can certainly be added by Thunderbolt. I suspect that Apple would expect people that want to use 3D goggles on their Apple computer would just use Thunderbolt rather than VirtualLink. This is a pretty high end feature and so if Apple supported it then I'd expect them to advertise this where we'd notice. VirtualLink was introduced in 2018 and is a protocol that is used for 3D goggles. HDMI takes all 4 high speed data lanes and so it makes sense for Apple to choose to support HDMI on their mini-docks with DisplayPort to HDMI circuitry, this preserves the use of 2 data lanes for USB 3.x. MHL seems to have died with the 5 pin mini-USB-B. APPLE 2016 MACBOOK PRO PORT ANDROIDThis means it could share the USB-C connector with USB 3.x but this is a protocol not widely used outside of Android devices that used MHL on mini-USB-B ports. MHL, like DisplayPort, can operate on 1, 2, or 4 high speed data lanes. DisplayPort won out no doubt because it was already integrated with Thunderbolt, getting DisplayPort and Thunderbolt to play nice with each other on the same cable was a solved problem. Apple has little motivation to support multiple video modes, especially when they offer such similar features. MHL, HDMI, and DisplayPort are all video alternate modes for USB-C that came out before 2017. Looking up the supported USB-C alternate modes I can find HDMI, MHL, VirtualLink, audio adapter accessory mode, and debug accessory mode. I'm curious, why you believe there are more alternate modes supported? What do you believe those additional modes might be? I'm pretty sure the USB-C ports on Apple computer support only the modes you listed.
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