It can be difficult to interpret pictures. My guess is that the blade is relatively flat until the line identified as the medial ridge, and that the edge slopes from there. Pressing the blade flat against a table, looking to see if the edge is coming up at an angle or alternatively seeing if the edge is parallel with the table, would test this very easily.
The tang follows the curve of the handle to the peened end. It is not unusual for Chinese dao to have a handle offset toward the back of the blade like a kitchen knife.
To me, the fullers look like provincial work that was filed rather than chiseled, leaving two small grooves as evidence at the base of where the fullers come together. This does not seem like Japanese work, or work from a more refined area of sword manufacture in China.
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