Motion blur would blur the lunar horizon as well. I'm pretty good at picking out motion blur, and I don't see it here.
Another possibility to consider is that the dark bulk on the right of the photo is likely the LM nose, not the window frame. (Can't say the same about the dark bulk on the left.) If that's true, then window would be rotated about 45 degrees to the optical axis, meaning that a reflected object could be across the cabin. We can be confident that it's not any closer than about 24 inches to the window, but it may be as far away as six feet. The LM nose would actually be closer in that case.
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