As for the whole "deconstruction" thing... sometimes I think it's a vestige of obsolete thinking about what the comic-book readership is like.
In the old days, the average turnover of a comic-book fan was about 4-5 years. After that, the old audience leaves and a new one comes in. So you can get away with telling the same sort of story over and over again, because for the most part, only the hardcore nerd would REMEMBER the old stories.
But that hasn't been true for quite a long while. For one, it's far too easy to discover a character's history nowadays, between Google, Wikipedia, and various wikias. And for another, most of the (shrinking) readership is composed of fans who have been reading for a while, and have seen all this stuff before. Oh, there's still a percentage of new readers coming in, but for various reasons, most never seem to stick around.
I think part of that is they're trying to be too adult for their main books.
It's like cartoons from the 90s. They were action and fun enough for kids, but mature enough for an adult to still enjoy. Specifically shows like ExoSquad, Gargoyles, and BatmanTAS.
But that is something that I think has been lost lately.
Yeah, that's what I thought. I was like, "Uhh... The Adversary is a mutant villain. Like... What?"
That would make sense. But still. Just so odd to have a Native American themed villain be some long standing historical ancient enemy of an African land.
I also think they're hoping it'll be a "hopping on point" for newer readers.
Honestly I think Coates is trying to snag a few lesser used rogues from other characters galleries to buff up T'Challas.
To be blunt, aside from Klaw I think BP'S rogues are a bit on the under powered side. So snagging a few Iron Man and X-men rogues who aren't being used can potentially help with that.