I do strongly believe it is a feminist issue. Protecting women and girls from male violence and exploitation is a key tenet of feminism. There's also an intersection here of feminism and classism, as most victims were from disadvantaged socio-economic backgrounds, or already survivors of trauma, which make a woman or girl especially vulnerable to male violence. Also as a result of their socio-economic status, I believe the victims were ignored and gaslight by police and social services who regarded them as somehow already 'damaged goods' and therefore not worth saving. Andrea Dworkin wrote extensively about how the 'damaged goods' and 'promiscuity' tropes lead to intersectional oppression of female victim due to the double oppression, firstly from the predator and secondly from the indifference of police, social services, local authorities and policy makers. Julie Bindel is also very good on this.
So in conclusion, yes, I do think it's a feminist issue. I don't know whether Musk sees it this way and to be frank I don't care. I'm really pleased that since Wednesday 1 January he has been using his international platform to put a spotlight on it.
I've honestly seen more outrage from British feminists over the plight of women in Afghanistan than I have over this. I saw more feminist thinkpieces about Sarah Everard, or Jane Austen on banknotes, than over this decades long abuse. And whilst the plight of Afghan women MUST be highlighted, and Jane Austen is....cool, I guess, we need to put our own house in order before we look at others' houses so to speak.