Thanks Web Guide!
I have looked up the link and I know the organization you've mentioned. But at the paragraph I referred, it's talk about the US strategy in South East Asia and it would not be along with the idea the author is trying to say. If you take a look at the link, the organization has actually rejected the application of the US. In addition, the members are 中華人民共和國, 哈薩克斯坦共和國, 吉爾吉斯共和國, 俄羅斯聯邦, 塔吉克斯坦共和國, 烏茲別克斯坦共和國... none of them are at the ASEAN region.
That's why I asked if this is a typo or not. ^_^