I just now got it to work, I was missing the /% at the end of the macro.
For anyone else trying to accomplish setting the path to a page using a page guid in a repeater webpart, or any web part that has a place to set a content path, it must end with /%
{% Documents[Documents.Where("NodeGUID = 'yourNodeGUID").FirstItem.NodeAliasPath].NodeAliasPath#%}/%