I'm 99% sure that's not true. That would invite intimidation, coersion and witness tampering. The restraining order is granted by the court to protect the victim. There are arrests all the time in the police log of people who have violated no contact orders against each other and are both arrested.
I don't have a link or anything but I can agree with you that it isn't true. I recently worked with a couple who had a restraining order/order of protection/no contact order and they were caught together, both willing, and both were arrested for the violation. You see it frequently on the cedar valley mugshots that two people are arrested for violating their order.