An accelerationist is picking someone who will collapse the empire due to incompetence and destroying American institutions. Between Trump and Harris, I don't see Harris causing a collapse of American institutions like Trump.
Also, in regards to Iran, Trump has been far more antagonistic than Biden and Democrats in general were. The Biden administration at least needed a false flag attack to support Israel and a lot of the opposition came from Democrats. Trump got rid of Obama's multilateral nuclear treaty and has participated in Israeli attacks where Israel was the aggressor.