Since that is one of Ellis's books on martial arts, I have read it cover-to-cover twice and have gone back to it for specific passages innumerable times. I do not believe there has been any solid evidence unearthed that indicates that Ueshiba or Takeda had any direct influence from Chinese martial arts.
Nobody argued that. OTOH, they had no direct contact with Chinese Confucian scholars either, but it would be ridiculous to try and argue that they were not influenced strongly and clearly by Confucianism.
Hiroshi Tada makes a relevant comment at the bottom of the interview here