It's a study using 10 people. So the best way to interpret it is to ignore it.
However, "One potentially important outcome is that all six of the patients whose cognitive decline had a major impact on job performance were able to return to work or continue working without difficulty." which suggests a significant improvement even if it was simply temporary.
However, "One potentially important outcome is that all six of the patients whose cognitive decline had a major impact on job performance were able to return to work or continue working without difficulty." which suggests a significant improvement even if it was simply temporary.