This seemed to be quite needed for students to get up to speed. I was from Finland, where this subject was brought up before uni.
For what it's worth, I remember my supervisor calling bullshit on my then dense and overly academic writing and I thank them for it. It was a process of un-learning bad patterns or preconcieved notions about the writing process.
Recommend.
This is also "just" learning by doing. There is some back-and-forth with PhD students who help with the structure, but there's no explicit instruction.
In the context where I taught, most students coming into the PhD program had no training in writing whatsoever. The first round of essays that people turned in were typically very poorly written. Most folks really needed the training in my view.
I think it's actually better to seek writing advice on the Internet (not from randos, but if you're cut out for a PhD you should be able to tell apart crap advice from good ones.) I'm pretty sure it's better than whatever my university could offer as a course.
And just as everywhere, 90% of everything is crap. Perhaps more than 90% of papers are crap and 90% of academics have nothing to say and write terribly to hide it.