A lot of huffing and puffing about their lack of ability to fly a VOR approach. I doubt that is the case. So many experts!
However, as the report points out, it was more to do with automation.
Automation confusion lead to a lack of situational awareness.
If they planned that approach using Vertical Speed and a Lateral Nav Mode from the start, there would have been no problem.
They were caught out by the unexpected behaviour of VNAV PATH, and from that point were unable to recover from the automation surprise!
And that is a big problem these days.