Isn't superstar basically a popularity title? Bron is definitely a superstar in terms of status.
In terms of actual play, it basically depends on how many players you want to call superstars. He's a lock for 2nd or 3rd team All-NBA yet again, and how many of the other guys do you trust in the playoffs more than him? I'd love to see a list. It's damn hard to leave him off a top-10 list based on his play unless you just really don't like him.
Regular season: 26-7-8 on 54/41/75 shooting splits. That's comparable to a Dr. J or Larry Bird MVP season.
Playoffs: 28-7-9 on 57/39/74. Ninth highest scoring average of all players with good all-around play and efficiency. How many players clearly outplayed him so far this postseason? Definitely Ant, Jokic, probably AD, Shai, Brunson, and after that it's debatable. If you don't think he was playing like a superstar, then no one else has been playing consistently like a "superstar".