I believe there should have been more effort spent on getting the computers into "direct" law. The pilot's belief they were already in "direct" law seems to have been based on a (flawed) observation by the captain regarding the auto-trim.
It appears to me that the pilots were overwhelmed to some degree, which should be a concern given that:
1. The fault was minor;
2. The aircraft was in clear VMC conditions in broad daylight;
3. There was a 3,000 metre runway less than 100 NM away;
The author/investigator seems to have excused the pilots, on the grounds that they were confused.
Id be confused as well if my head had been used to punch a hole in the ceiling of the galley........
aircraft landed. No-one dead. Success.