Joe Biden didn't change the name of Black history month, it was rather a deepfake generated by AI to make people believe he said that. According to BBC this isn't anything new "Baseless claims about President Biden being a hologram, CGI, deepfake, masked, cloned, played by a body double or recorded in front of a green screen are not new. They have been spreading on the fringes of the internet for a long time, and have sometimes gone viral". I think it is important for people to be very aware of what AI can create to ensure that misinformation is kept down.
https://www.bbc.com/news/62338593