He wasn't suspended because he is a Brexiter. He was suspended because he went against the organisation's agreed stance of neutrality. In other words, exactly the same would have happened if he had expressed pro-Europe views.
I think it was clearly stated that "He was suspended because he went against the organisation's agreed stance of neutrality" and of course it would be the same " if he had expressed pro-Europe views", i think the point with most is that he feels that Out is the better option and this from a senior figure, not whether he would get fired whether he supported In or Out.