I do not think you will need to run away from any hounds on this issue. It has been debated before and turns on what is accepted as evidence. Morihei Ueshiba visited Mongolia on several occasions and it is possible that he had the time to study Chinese martial arts. However, we would need to examine the evidence. As others have noted, Ellis Amdur is one of those who has discussed the issue.
However, the question whether aikido is related to Chin Na (because both are martial arts and might embody similar principles) is different from the question whether Ueshiba himself actually studied Chinese martial arts.
The answers to both questions are speculative, in my opinion, but are different answers.
Best wishes,
Peter Goldsbury,
Forum Administrator,
Hiroshima, Japan