"There is no requirement to return home for a renewal of a permit that was issued without a similar requirement." 
From your own link:
"Providing Incentives for Return to Home Country: The program will require the return of temporary workers to their home country after their period of work has concluded. The legal status granted by this program would last three years, be renewable, and would have an end."
"Providing Incentives for Return to Home Country: The program will require the return of temporary workers to their home country after their period of work has concluded. The legal status granted by this program would last three years, be renewable, and would have an end."You omitted an important clause from your emphasis.
A requirement that guest workers return "to their home country after their period of work has concluded" hardly means they have to return home to renew.
If they renew their period of work would not be concluded.