I typed 'Accreditation' into the search engine on that website and found this link on the first page: https://www.uopeople.edu/student-experience/quality/accreditation/ It's not *super* difficult. 

My impression was the school is registered in United States but is an offshore entity managed by Indian or outsoucing its employees from India and offices are based there. 

That has nothing to do with its accrediation. I'm not sure what point you are making. 

Are you asking if a legitimate university can be accredited in the US, but managed abroad and use part-time staff for most teaching? Well that's almost very American university outside the USA. Amity is also a good example of a US-accredited university (with regional accreditation, better than UoP's national accreditation) which is headquartered in India and [like most online colleges] mostly has part-time staff. 

PS I don't think it's right to suggest that UoP *outsources* its teaching, in the sense of hiring another company to deliver that.