If someone looks at a corn field and says "That's not natural! A farmer planted that!"
I could say, "What you say is misleading. That field contained plants before the farmer arrived. Maize predates American farming. You should only say that the farmer shaped the plants that are available now."
I don't feel like going deep into pedantry or having a back and forth on this, so I'll just say that I agree with this part of your statement:
"Native Americans reshaped the forests and managed the burns which were already happening."