I also think that that book is a "to some extent" good book.
But, of course, that is not written much in detail.
For example, they have described a certain Buddhism in Japan like this.
*** sh chap. 6 p. 148 par. 33 Buddhism—A Search for Enlightenment Without God ***
These principal divisions of Buddhism are in turn subdivided into many groups, or sects. Some are devoted to a particular leader, such as Nichiren in Japan, who taught that only the Mahayanan Lotus Sutra contains the definitive teachings of the Buddha,
This explanation is correct "to some extent."
But correct information does not get across to people only in that.
He (Nichiren) had stated as follows 750 years ago.
"There is no Pure Land or Hell outside of ourselves.
They only exist within our own breasts .
One enlightened to this is called a Buddha.
One deluded about this is called a common mortal."
("Ueno Dono Gokeama Gohenji" ( "A Reply to the Widow of Lord Ueno"))
Although that is official translation into English, I translate like this.
"That "paradise" and "hell" are not outside us, but they exist only within our heart."
He taught that "hell" and the "Buddha" are in our inside/heart.
And he taught to worship that Buddha presence within you.
People cannot acquire such information only by reading the WTS publications.
possible