"is there a movement towards broadening that definition to encompass any kind of sexual assault?"Not that I'm aware of (and I'm relatively familiar with the feminist activist community and current feminist writing). I read it to mean she was raped by a colleague, not that she was sexually assaulted by a colleague, though either would be inexcusable and should be subject to the person being fired. But, again, in a workplace that is hostile to women, dismissive of women's words, and in which the person doing the raping or sexual assaulting or harassing is in a position of power over the women being raped, assaulted, or harassed, it can go on for a long time before someone is willing to throw away their career to make a public accusation, which is exactly what this article is about and why I think it's valuable.
There are, clearly, a lot of men in our industry who have literally no idea that this stuff is happening. Zero awareness to the point their instinctive response is to deny that it is true, or to attempt to redefine the words to mean something more palatable.
So, let me be clear: You've read an article about someone's experience in the workplace as a woman, and you're first response is effectively to say, "This cannot be true."
The author of this article is not the only woman to discuss these issues or to experience this kind of behavior in the workplace, particularly in tech though it is true in many industries. As long as the response of men in this industry is to read these experiences and immediately deny the words and counter-accuse the woman of lying, exaggerating, or "being dramatic", the problems will never go away.