What particu;arly rubs salt in the wound here is the close relationship between Bucky and Wakanda – who is known in the African nation as White Wolf.
The man formerly known as The Winter Soldier was a fugitive at the end of Captain America: Civil War, still vulnerable to Hydra’s hypnosis, but T’Challa gave him permission to stay in his country, and it was there that Bucky was able to rehabilitate and get better (it’s why Zemo’s recitation of the command words don’t work).
The fact that he directly helped the killer of King T’Chaka is most assuredly not going to sit well with anybody, and as a result Ayo may not feel compelled to show him any leniency, regardless of his explanation for his actions.