Haven't we already done this with you? Ah, here we are!
http://www.martialtalk.com/forum/sh...e-Bujinkan-was-actually-used-in-ancient-Japan
They're getting to be old news now, but there's a fair few discussions around like that. Read, search, then make up your own mind.
A martial art is not it's "moves". And every move can be looked on as being a "fact" (it exists, you can be taught it, it can be demonstrated etc), they exist within particular Ryu-ha (martial traditions), your question is how many of the Ryu-ha are legitimately as old as they claim to be. Within these arts, that will be an eternal question. If it bothers you that much, I suggest moving on.... but recognise that it is not restricted to the Bujinkan arts. Kashima Shinryu, for instance, claims a history back to "The Age of Gods" (the 8th or 9th Century), which is what the Ryu teaches, however it is pretty much acknowledged that the actual founding date is closer to the mid 16th. It is reasonable to think the same of things like Gyokko Ryu and others.
Er, yes, he is. And that proves...? For the record, he was from a relatively well-off family, has large real estate investments, and would still be very wealthy even without the Bujinkan. The taxation issue with the Bujinkan becoming a religious institution is more to do with retaining control over who gets left the material possessions of the Bujinkan, rather than letting the Japanese Government take some or all of it (old weapons, scrolls etc).
The same ones... really, the obsession with "moves" really misses the point. If you're refering to the Ten Chi Jin Ryaku no Maki, it can be thought of as a 'best of' collection of some of the Ryu-ha's teachings. But the same techniques are taught today, and were taught before Hatsumi got sick. The method of teaching, however.... oh, and for the record, those guys on Bullshido discussing the TCJ had absolutely no idea of it's structure, or the way it is designed to be used, so don't worry about anything they had to say on the topic.
Really, it'll all depend on your teachers understanding, and the approach they take.
When you talk about it "working on the street", though, what makes you think that a centuries old martial tradition, designed for attacks from a completely different time and place, with very different laws, social customs and considerations, cultural targeting concepts, attacking methods, weaponry, clothing, and more will be in any way immediately suited to a modern self defence scenario? You're getting lost in the movie fantasy of martial arts being the answer to modern violence, and that just ain't the truth of it.