I think, given the structure of phrase, we can assume some irony there - not only baseless dismissal. EM drive remains pretty controversial, and does present s

I think, given the structure of phrase, we can assume some irony there - not only baseless dismissal. EM drive remains pretty controversial, and does present significant problems with explanation, and as an extraordinary device requires extraordinary evidence. So it could be conceivable not to focus too deeply on a remark which isn't the main point of the article.