An assault of against the entire legitimacy of the judicial branch is hyper radical. Naming the news media the enemies of the American people is hyper radical. Illegally ordering legal permanent residents be detained without due process is hyper radical.

Some of his policies aren't radical, sure. He is a populist. The fact that one time he said he likes the welfare state and one time he said he didn't, or that one time he said he wants to scrap ALL of ACA and then some other time he described all of the policies in ACA and said they were good and wouldn't go away doesn't mean he's moderate, it means he's incapable of telling the truth because his mind changes too quickly to have a consistent position. But regardless, the president doesn't set policy, congress does. He leads the country in words and action, acts as the head of state diplomatically and oversees enforcement of the laws which the legislative and the judicial branch decide for him.

In that sense as the leader of our country he is the most radical president I can think of since FDR who was a wartime leader and was rapidly approaching a dangerous permanent control of the country.