I’m struggling to see how Treks move is harmful – not sure how it can hurt women in the industry or men. Seems a bit if a non-issue time.
It could be seen as harmful to some (perpetuating the idea that women need special treatment or that the ‘industry’ has a problem with hostility to women, as per your example). It should be that case that TREK make sure their courses are not places where they need to hold separate classes to resolves those issues, and indeed that’s the case, they are promoting this course to try and entice women to attend who may normally not. Why would they not? perhaps because those women grew up where they did not always receive or feel they received equal or non-sexist treatment.
Of course im sure majority of women would know any mixed gender courses like this (ran by a reputable company) would not be places where they should be uncomfortable, but you cant change how people unconsciously feel. Im sure I would be treated fairly and equally in a training course where women are traditionally the primary employee, but id still feel apprehensive if it was in a subject I wasn’t particularly confident going into it.