Yes, you are missing something. Didn't you read the paragraph directly preceding the paragraph you cited?!?
For your reference, it says,
"5. Bujinkan Ryu Ha Listings in the "Bugei Ryu Ha Daijiten"
The following are excerpts from various editions of the Bugei Ryu Ha Daijiten ("Great Dictionary of Bugei Schools") - which some people believe to be the foremost and most exhaustive work on Japanese koryu bujutsu ever published. However, the information it contains should never be taken as 100% correct, especially when it comes to describing the Bujinkan ryu ha. The entries change from edition to edition. Although it has been suggested that Takamatsu Sensei and Watatani Kiyoshi (the primary author) were "friends" - and "confidence between friends" justifies Watatani's portrayal of the ninpo ryu ha as "fabrications" (see below), this cannot be the case. Watatani had his own agenda; the fact that he did not believe in the legitimacy of the ninpo ryu ha is evident in his writings, especially the earlier editions. However, even though a ryu ha is not favorably mentioned in these books, this does not mean that the martial art is not legitimate - only that someone uninvolved in the tradition believed it not to be true. In the Bujinkan, the secret teachings were never written in detail with brush and paper, only transmitted vaguely in cryptic words and by kuden (oral tradition) that only the soke may truly understand. These translations are provided for reference only. - MZA"
Please note the VAST differences between the two versions of the book. If the assertions made in the original publication were as irrefutable as implied by the writing, then those claims certainly would not have changed so dramatically in the revised version. Just some food for thought, in addition to Michael's caveats from the preceding paragraph.
-ben