This is not true. Are you Ryukyuan? Do you know these things? Ryukyuans are not Japanese, and will never be Japanese. In any case, over 50% of the population is not satisfied with the status quo of being a prefecture of Japan.
Yes, the Diaoyu Islands have always been recognized as Chinese. Ryukyu has never claimed Diaoyu. Even the Japanese before the Meiji Restoration recognized the Diaoyu Islands as Chinese.
Even Europeans recognized that the Diaoyu Islands belong to China, and that Ryukyu is an independent country, as we can see in this map made by French cartographer Jean Baptiste Bourguignon d'Anville in 1752: