Clarification:
My prior comment strictly refers to 'text put on path' in this specific file (sorry for the unclarity) - the existing text does not render flipped / mirrored in Inkscape 0.92, nor does regular or flowed text added to the current drawing level in Inkscape 0.92 appear flipped / mirrored.
Could you please share a screenshot how the existing text in this specific file renders on your system, and which option to change the DPI on load you chose?
Clarification:
My prior comment strictly refers to 'text put on path' in this specific file (sorry for the unclarity) - the existing text does not render flipped / mirrored in Inkscape 0.92, nor does regular or flowed text added to the current drawing level in Inkscape 0.92 appear flipped / mirrored.
Could you please share a screenshot how the existing text in this specific file renders on your system, and which option to change the DPI on load you chose?