"The Blur's" appearances were just a blur. A red and blue blur and who was wearing a red and blue costume this episode? Any instance where someone may have seen more than just a blur were shot down asap by Clark, Chloe etc. Why wouldn't 99% of the population just assume that Kara was the red/blue blur? Lois has written about "him" but most readers only look at headlines and half an article. The rest would think Lois just got it wrong. I can't see how the world wouldn't be assuming Supergirl was there all along as The Blur.