It's been mentioned in another thread:
It must irk the WT powers that be. In the 90s Japan was the GB's golden child, held up as the example to be followed. They were the "African brothers crossing crocodile infested swamps" of their time.
Cue mandatory "We don't abuse anybody " quote from the Japan branch.
Not knowing much about Japanese politics, how likely is a report commissioned by the opposition to get traction in The Diet?