Whatever suits your narrative.
Politics are all about narratives. Hillary won Iowa, yes, but the media has not been playing it that way because they want a horse race, so they've been playing it up as a tie. This will undoubtedly have some sort of effect on Bernie's favorables, even if it's not as drastic as this poll may indicate.
It's not ridiculous to say that a candidate coming from a 50 point deficit to 0.2% behind could be viewed as a tie by a large amount of people.