I can confirm the change in that commit works for me.
The import ran through without so much as a hiccup, and at first glance the forum with the imported data is looks nice.
It will take me a little while to poke around because I’m just getting started with discourse, but I think it’s fair to say the import was a complete success this time.
Thanks to everyone involved in this discussion, and @zogstrip and @evanw in particular. It’s a special thing to be able to take a support issue and turn it into a great experience (really the highlight of my day).
If you need anything else from me, just ask.