Read this very slowly:
EA told CVG that the RB2 will be released in September thinking they were still talking about the US release but they did not notice that they got asked about the European release date.
After finding out that they made a mistake in that interview they told Eurogamer (and other websites) that there is no fixed European release date.
Hell why don't you read this:
videogaming247 » Blog Archive » Rock Band 2 release is “the same for Europe” (updated)
Notice how EA confirmed to VG247 RB2 will be released in Europe in September (Second Paragraph). After EA noticed the mistake they made (A day later may I add), they contacted them and VG247 update the web page accordingly (First Paragraph).
So why don't you just accept that EA made a right C**k up by telling people that RB2 will be released in September only for them to say that they made a mistake or are you going to be such a f***ing retard by thinking you know everything when you don't.