Is it illegal for Foshan disabled people to work at home?

Not illegal. According to official website, Foshan Disabled Persons' Federation, home office is legal, and the company has the obligation to protect the rights and interests of disabled persons, including providing reasonable working environment and facilities, and prohibiting employers from discriminating against or depriving them of employment opportunities because of their disabilities. Therefore, it is not illegal for Foshan disabled people to work at home.