They did not report his location to the authorities and allowed him to work across state lines without any changes to his employment agreement.
I later asked Github HR what their policy on domestic violene is. This is what they sent.
"Microsoft is committed to working with employees who are victims of domestic violence to prevent abuse from occurring in the workplace. Employees who are concerned about violence occurring in the workplace should immediately discuss their concerns with the Human Resources (HR) manager assigned to their group. The Microsoft Global Security group can provide guidelines and suggestions for increasing your safety in the workplace.
Employees who are experiencing domestic violence outside of work are encouraged to seek assistance from Microsoft Cares. Microsoft Cares provides information regarding counseling and treatment resources. Perpetrators of domestic violence are also encouraged to seek assistance from Microsoft Cares.
In some situations, employees may be eligible for time off work or other accommodation to manage medical issues and other negative consequences arising from domestic violence. Contact Benefits for more information."
They officially accommodate "perpetrators of domestic violence" as Microsoft-owned Github.