IMO- this doesn't meet the classic definition of a Mixte, or Unisex frame. The (split) top tube is definitely lowered to open the diamond, and despite being a split tube design it more closely matches a classic ladies frame with standard seat stays, than a typical mixte frame which lacks them.
However, I'm not a museum curator and don't get worked up over semantics or classifications. It is what it is. If you want to classify it a mixte based on the split tube design feel free to do so, or if you prefer to classify it as a ladies frame based on the overall lines, that's equally OK.
BUT
You might take a minute to correct the dropped chain before taking a photo.
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