Well, frankly, yes. SWGs get beaten up all the time by other SWGs in L.A. Noir ( whether they deserve that or not is another matter, but it IS ONLY fiction we are talking about ).
If you tell your player they are going to be a hardboiled SWG detective in an L.A. Noir setting I don't think they'd be terribly surprised or offended if their character gets beaten up during play.
However if your player wants to gender-swap to a female private eye, but play the scenario as written, then you are introducing physical violence against women and possible lesbianism; issues that might offend the sensibilities of certain players ( which is what the whole boxed text is talking about ).
Although the original quote you picked out makes it sound like SWGs deserve to be beaten up that's not how I interpret it taken in context. In context it's saying SWGs get beaten up all the time in L.A. Noir fiction ( and again I stress the work FICTION ).
Nobody is talking about beating up SWG players ( just characters! ).
In or out of context if that statement had been made about any other group then twitter and rpg.net woud have lit up like a christmas tree and there would have been demands that game stores and drivethrurpg/rpgno not stock the game They could have made the point about not wanting to offend certain people (as you put it) with out creating a TLA label. You obviously have never read any Ellroy or watched anything based on his work if you think that white CIS males are the only ones that get beaten up in LA Noir.