I’m not sure why you’re pretending to be puzzled; regardless of the veracity of the complaints, the Bulletin board was concerned enough that they did not want him there:

“Krauss resigned from the position of chair of the Bulletin of the Atomic Scientists Board of Sponsors when informed that its other members felt his presence was distracting "from the ability of the Bulletin to effectively carry out [its] work".[34][35]”

And could you spare us the boilerplate reactionary moaning about outrage culture?