I understood the part in brackets as being an editor comment, not part of the actual email.
The quote is: "Anyway, I wanted you guys to know that you’re free to use RC [RealClimate.org - A supposed neutral climate change website] Rein any way you think would be helpful.".
However, the fact that the people in the email are moderating the comment queue at RC.org clearly shows that they ARE running that site, hence the editor's right to call into question the neutrality of the site.
"neutrality" is a charged word. To claim neutrality you would have to agree that there are legitimate claims on both sides of a controversy. I wouldn't blame RC for taking a stance if they believe their point of view to be correct. Did they ever claim to be 'neutral'?
[edit: to be clear, I never visited RC before, I don't know how they cover or are supposed to cover the debate over climate change]
The quote is: "Anyway, I wanted you guys to know that you’re free to use RC [RealClimate.org - A supposed neutral climate change website] Rein any way you think would be helpful.".