I wouldn't post a bug from a video, but even if I did I would link the video, not a pic of Shira's description.

I was playing around with him in arena after I obtained him today. 5k gaara + gai + shira + water main so no other extra attacks.

I tested it out some more and I saw him hit 3 different enemies in the same turn again, same team as above. None of them died and no clones were hit. Was konohamaru, 6p naruto, and edo hanzo that he hit. For all I know it could just be a typo in the description, or possibly a bug when he hits someone capable of dodging that makes it so they don't count as 1 of the 2 targets.

He does get a 4th attack at 4 star btw.