Given the number of symbols in each word, I believe you are correct in guessing what this user said and tried to hide. In this case, this is concerning: if such messages are so widespread as to be recognisable even under such abstract signs, the black nationalist dog whistles truly must be generally accepted by the vast majority of internet users, otherwise they would be more hidden. In this case, I am afraid that the South African white genocide will continue uninterrupted and that the South African government will succeed in their designs of creating a new, black, apartheid state.