No, but it makes every Jjj school suspect, because like many TMA styles its legitimacy is wrapped up in dusty old history books, and not on its effectiveness. Unlike Judo, Bjj, Boxing, and other styles that are pressure tested by every wanna-be MMA guy or meathead that pops in, TMA instructors can sit back and peddle bullcrap upon their students for decades and no one will question it.
And this is why I talk about people doing their homework. IMHO, anyone who would make a large purchase, without investigating what they're buying, is a fool, and deserves what they get! Would you spend hundreds of thousands of dollars on a home, without looking at it? How about a car without a test drive? I'm the first to say there is a lot of crap out there, but there are also a lot of what *I* like to call the 'rare gems'. Those things do exist, but you have to look hard to find them. There are a few JJJ schools around my area, as well as in neighboring MA, that are good quality.
I've said it throughout my posts. And no, most TMAs don't have alive training. Simply the nature of the beast. That's why their demonstrations don't match their sparring.
Keep in mind, the majority of demos that you'll see, are just that...demos...usually which are pre set. Of course, as I've said, just because a clip of an art, doesn't show something on youtube, does not mean that it doesn't exist.