And, the suit's a suit, not a power.
A suit that puts you around the level of low meta < powers that do the same thing.
It's how the tiers work.
T'Challa's suit can be cut at the seams, and is much easier to do away with than a power set.
And seeing as she's only got metal claws, not metal bones, his anti metal claws would only be useful in a parry. But the nitty gritty of a battle between them isn't that important.