Sure, that's why everybody's Communist here now.
That's why all private enterprise was nationalized in the Thirties.
That's why millions of Americans died in our Gulag.
That's why the White House was painted red and the Statue of Liberty was replaced by a monument to Lenin.
C'mon. If FDR were actually and literally a Communist our history would have been very different from what it was and we'd be a very different country than we are now.
Presidents have limited ability to change things without the cooperation of the Congress, the Supremes, state and local governments, and popular opinion.
You think a future conservative president could issue an executive order and abolish the EPA, HHS, Dept Ed, etc, etc all by himself?
FDR pushed us as hard as anyone could in the direction of socialism. If he hadn't died, he might have pushed us even further.