Is Black Panther (T'Challa) superhuman?

For most of his history Black Panther was considered ‘peak human’, which carries a rather different meaning in comics in general and Marvel especially than one might expect; our laws of physics don't permit things like light speed reflexes or the ability to loose Mach 438 arrows or the ability to outrace explosions or the ability to judo throw rhinos or the ability to casually crack concrete pillars that can be seen in some of Marvel’s peak humans. Nor for that matter the ability to deflect bullets with one's bare hands and kick decades-old trees in half like we see in DC.

Later Black Panther and Captain America were retconned to be considered just above peak human. Of course, since the speed and strength of comic book peak humans is largely defined by skill, someone who manages to somehow exceed the skill of two of the most skilled fighters on Earth, like Taskmaster, can still keep up with them, despite lacking even a marginally superhuman physique.

Quite recently, Black Panther received a pretty major power boost. He is now the King of the Dead, and thus has the combined strength, speed, durability, intellect, skills, and memories of every Black Panther throughout history. Actually quantifying what this means has yet to be managed, but from what's been seen so far, calling him roughly physically even with the Thing seems like a reasonable assumption. In any case, the King of the Dead is inarguably beyond the limits of any baseline human, no matter how skilled, and is thus officially superhuman by Marvel standards.