They asked about the policies in the abstract, not “Do you agree with Trump’s policies?” That means the phrasing of the questions would strongly impact the likelihood of people agreeing or disagreeing.

For example, when asking about Trump’s immigration policies, did they ask if people supported “Reducing immigration” or “Deporting immigrants without due process or any consideration of their legal status, to countries where they will be incarcerated in prisons that are little more than concentration camps, without access to legal representation and with no guarantees of their human rights?”

Without seeing the specific questions this poll is meaningless, but given the results I think we can already guess how those questions were framed.