Is Siu Keung's movable type authentic?

Really. Siu Keung is a member of China Calligraphers Association, so the calligraphy sold is genuine. Siu Keung, 1953, a native of Gu Yue, is a member of China Calligraphers Association, Guangxi Calligraphers Association, Guangxi Artists Association, China Strait Calligraphers Association, China Humanities Calligraphers Association, Peking University Oriental Calligraphers Association and honorary vice president of Chang 'an Oriental Art Institute.