He didn't, "vr god help" is trolling us, giving false hope (vr god help is a bitch). EXE files are executable files that can only run on Windows, and you would need an APK, which Dani unfortunately hasn't provided.
good question i havent gotten the chance to try steamvr yet but i assume thats what he did bc i cant think of any other way without modding the headset a shit ton