At what point does mold make a canvas tent unsalvageable?

I was gifted an old Kodiak Canvas Flexbow 10x10 because the previous owner didn’t want to clean it after discovering mold on the interior ceiling.

The fabric is otherwise still seems strong, so I wanted to give it a shot. Started with a 10 hour vinegar soak (1 part vinegar, 4 parts water), followed by a 10 hour Iosso Mildew Remover. The stains are about 40% of what they used to be, but still VERY pervasive.

Is this a futile effort? Is it possible that the mold/spores are all dead and that these are just color stains? I’m not worried about losing the waterproofing on the material (I can re-condition the fabric), but my goal is to mostly, if not completely, eliminate the spots.

Photo of the interior ceiling (tent is inside out) taken AFTER the vinegar and Iosso soaks.