T'Challa does not get permanently killed off in that storyline and in fact comes back to fight Doom.
And if you've been paying attention most people don't think he's going to be permanently killed off in the MCU either. They're either going to have a multiverse version come in or his son will take over his mantle. Possibly even both. They just didn't want to do it right away, they wanted to do a tribute to Chadwick's passing first.
Na, he's saying they're erasing black men as leaders in its entirety. Hollywood does not like writing Black people successful without the help of white men. All these other little side characters to makeup for erasing T'Challas legacy is pure comedy.
No one has "erased T'Challa's legacy". He was supposed to star in the first three movies but then real-life shyt happened. How will the "erase" his legacy in the movie when it's clear a substantial portion of this movie will be about honoring his legacy?
And struggling to see where you come up with them "erasing black men as leaders in its entirety". That's completely manufactured. Rumors are M'Baka is going to become the King of Wakanda and that another Black man is going to be set up to take on the Black Panther mantle for the 3rd movie. Nick Fury is still the leader of S.H.I.E.L.D. and is getting his own series,
Secret Invasion. Falcon has been elevated to the Captain America role as is going to be the lead in
Captain America 4 after coming off of his own movie. Blade in the lead in his own movie, War Machine is the lead in his own series, and Kang is going to be the lead villain and potentially the most powerful person in Marvel history when they do Avengers: Kang Dynasty.