I'm glad you posted this. I'm a songwriter, and losing my ability to sing has been the biggest thing that's held me back from transitioning. And I've never gotten a solid answer from anyone, as most of the trans people I've known haven't been vocalists.
I do know that cis males the transition is the hardest part. Many guys, even those gifted with amazing voices, often have a period during puberty where their vocal range consists of only three or four notes. That said, after the transition they usually recover quite a substantial range.
If the transition for transmen is anything the same as for cismen, then there shouldn't really be any lasting damage. I don't know if this parallel holds though, or if the process is different because of the amount of estrogen already in our bodies. But even if the transition is similar and there's no lasting damage, using a male voice is very different from using a female voice. And the voice that you have you've had many years to practice with. I mean it took me twenty-four years to perfect my instrument and now I'm looking at starting with a completely new one. Don't really know how I feel about that.
I'm gonna read that article by the way.