OK, ok, you are right. He may not have said that he wanted economic isolationism.
Of course we also know this premise is absolutely impossible in this modern global (not globalised) economy where every nation is connected one way or another economically. What happens to a little default in a greek bank may trigger a black swan in all markets, in the same way amerigo unending spending will eventually trigger a collapse of the usd.
However, the mass media has taken the slant that he wanted economic isolationism. Don't ask me which network attribute what and when regarding Trump. In their vicious attack against Trump prior to the election, Trump was made out to be a con man out to enrich himself and his proposed policies will lead to usa being politically and even economically isolated. Whatever the terms used, he is said to be leading usa towards ruin and world destruction....even now the attacks are continuing, only crafted in more polite and less obvious terms as can be seen in NYT and Washington Post articles or editorials.
Ok, enough said - the bottom line is that Trump is not so innocent as he himself purported to be. Even if he now wants to hold back the amerigo horse, eventually the black hands may still force him to act in the interests of usa. This will mean only greater tensions around the world as they seek to take back their undeserved American hegemony over other nations and peoples.