Is Wu Qingyuan considered a traitor?

No.

Mr. Wu Qingyuan is known as the "Chess Master". Although he became a Japanese citizen, he is not only not a traitor, but also an important promoter of peace and friendly cooperation between China and Japan.

In April 2014, Wu Qingyuan received the "Special Contribution Award" from the Beijing Municipal Committee of the Communist Party of China and the Beijing Municipal Government; in August of the same year, he received the "Peace Development Contribution Award" from the Chinese People's Association for Friendship with Foreign Countries , known as the "Envoy of Sino-Japanese Friendship"; in November of the same year, he won the "Outstanding Contribution Award for the Development of Go" issued by the Chinese Go Association

Mr. Wu Qingyuan was born on June 12, 1914 in Fuzhou City, Fujian Province, China He came from a distinguished family and later traveled east to Japan and later became a Japanese citizen. He was the promoter and practitioner of the world Go revolution and was known as the "Go Saint".

Extended information:

Many people in China, especially those in the Go community, speak highly of Mr. Wu Qingyuan.

1. Jin Yong’s evaluation of Wu Qingyuan

The two people I respect and admire the most are Fan Li in ancient times and Wu Qingyuan in modern times. In the two thousand years of Chinese and Japanese Go history, there is probably no second chess player who can stand shoulder to shoulder with Wu Qingyuan. This is not only due to his genius, but also because he has raised this art, whose only goal is to win or lose, to a very high level of life.

2. Nie Weiping’s evaluation of Wu Qingyuan

Teacher Wu Qingyuan is a kind-hearted elder whose contribution and selflessness are rare in the chess world. Wu Qingyuan has been devoted to chess all his life and has no distractions. He also asks other chess players to do the same. ...He was living in Japan at that time, and the conditions for him to play chess in Japan were very, as you can imagine, miserable.

Moreover, Japan’s militarism (ideology) was so serious at that time, and it was seriously anti-China and anti-China. It was very difficult for him to survive in Japan at that time. So I think it is very understandable for him to become a Japanese citizen

Baidu Encyclopedia-Wu Qingyuan