I don't know the legal answer to that, but let's assume you're right and Oracle doesn't need to comply with the GPL in order to distribute. That would mean they can give you a copy of the OpenJDK source code without giving you a copy of the GPL. However, that's not what they did. What they did is, they distributed OpenJDK *with* a legal document saying.
They gave people a copy of the OpenJDK source code with a legal document which has a load of paragraphs that start with "You may...".
If you're right, then you've only proved that they didn't have to give you that legal document. That doesn't change the fact that they *did* give you that legal document, and so, Oracle is bound by that legal document.