"Despite the efforts of the nationalist textbook reformers, by the late 1990s the most common Japanese schoolbooks contained references to, for instance, the Nanjing Massacre, Unit 731, and the comfort women of World War II,[2] all historical issues which have faced challenges from ultranationalists in the past.[3] The most recent of the controversial textbooks, the New History Textbook, published in 2000, which significantly downplays Japanese aggression, was shunned by nearly all of Japan's school districts.[2]"
Seems like that's been cleaned up and they were omitting information, which is bad, but when I think of misinformation I think of lies.
EDIT: Just to be clear, your statement was "where school history textbooks, an authorative data source of sorts, have had a rather optimistic view " which implies it is widespread and happening now. My counter shows that not to be true.
