TL;DR: Valve launched the Steam Frame VR headset with an Arm-based Snapdragon chip, aiming to run Half-Life: Alyx natively and streamed from PC. The new hardware features a “Frame Verified” status for optimized games, while rumors suggest two upcoming Half-Life titles supporting PC and VR cooperative play.
Support meaning in their build system. They’ve already added that as a build option awhile ago. Just means you can set a flag to build for more platforms now, and they have arm64 machine types to handle the builds.
Devs still need to do optimizations to support this in most cases. Some games based on open frameworks won’t have much to do but flip the switch.