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If someone says "Don't trust me if I can't find the key..." and then they refuse to provide the key, sounds to me like an awfully good reason not to trust someone.
While it is true that anyone with your private key could provide fake assurance, we are going off the assumption that you are the sole owner of the private key. It is clear from the video AMA that you are (likely) unharmed but I am still unsure about Wikileaks being compromised. Additionally, there's no drawback to you using the private key to sign a message, or any key for that matter. I don't see how signing a message would imply that you need to change how you secure your private key. With that said, the only reason I can think of to why you aren't signing any messages anymore, is that you don't own it anymore. Would you care to please prove me wrong?