Yes, they are fiction.
You can select other polls that show him with the best fav/unfav ratio of all the Republican candidates running. Donald Trump Favorable Rating Also Back in March 1980 the establishment said the same thing about Ronald Reagan. They said he could never defeat Jimmy Carter. He was too divisive.
That Trump-Reagan comparison is bunk. From the time of that poll that showed Carter leading, the Iranians continued to hold 52 American hostages, the economy tanked, the USSR was ascendent and ... more than any other... Trump is no Reagan... not even close.