Listen to him on the Cohen tapes. Totally different inflection and affect. I wouldn't go so far as to call him articulate or well spoken, but he at least talks like a human being capable of human speech.
https://www.cnn.com/2018/07/25/opinions/michael-cohen-donald-trump-tape-strategy-zelizer/index.html
True. Some, especially in another thread, would argue that this is mental deterioration. I don’t know if it’s an act, or more just speaking differently in different circumstances.