From the reddit comments:

A little context.
Vault39 is an acquaintance of another Russian streamer Leva2k, who is currently doing a bike tour of European cities. He called it the Tour De Rome.
Streamer Vault39 his subscriber, decided to travel from France by bike to meet him. While stopping, he was hit by a car traveling at a high speed.
An ambulance soon arrived on the scene and took him to the hospital. The streamer’s condition is currently unknown.

UPD.
Almost immediately after the incident, people passing by came to Vault39’s aid.
They gave him the scattered things, called an ambulance and stayed with him until help arrived.
Не is conscious and is now being evaluated.
His quote:

Everything seems to be fine.

gofile.io/d/GFlxcf