Japan's economic revival the past year is mainly because of Chinese imports. That is fact, you can google it to confirm. Japanese investment in China is miniscule compared to HK, Taiwan, European or American investments in China. China pulls a deficit in trade with Japan right now.
This article is about as informative as the CIA Factbook. In fact all it did was quote data from the CIA Factbook and then speculate wildly without justification. It also assumes that there will be military conflict between China and Japan, which is ridiculous. Worse it assumes that China is the one more unreasonable in the current standoff, when in fact there are growing factions in the Japanese government who support a more concillatory approach to China (i.e., some Japanese politicians are distancing themselves from Koizumi's visits to Yasukuni Shrine, which holds class A war criminals).
There are more and more Japanese businessmen who are favoring a more pro-China stance as the economic relationship develops.
It's true that Japan relies partially on China for economy, but the uprise of India has attracted Japanese firms for India as an alternative. Japan has been very uneasy about the anti-Japanese protests that occured months ago in China, and a Japanese embassy staff suicide for threats from Chinese intelligence to share secrets. In polls months ago, more than half Japanese showed strong distrust towards Japan, even more than the US. The government of Japan has also been very uneasy about the territorial disputes of the Senkaku island claimed as China's territory, and the Okinotori island which China claimed as rock, and China's aggressiveness for drilling energy source at East China Sea which the government of Japan claimed the energy source also may be connected on the other side of the boundry. while there are groups within the Liberal Democratic Party that opposes the visit of the shrine, those people have likely become a minority since the last election. The factions are losing power, and coservative/right Abe Shinzo of the Mori faction is still popular by the people leading polls for who is favored to be the next Prime Minister. The strong anti-Japanese trends in china will probably continue to push both away, and Japan will continue to seek India as an alternative for investing. Any other questions, which I may help you with my background of study on East Asia?