That extended scene is great. I'm a huge fan of the series - I devoured all of the books as a child and even made custom toys of the characters back then.
But the way Disney has marketed this is almost criminal.
https://www.hollywoodreporter.com/news/john-carter-from-mars-taylor-kitsch-budget-box-office-294822
Removing "of Mars" from the title is about the most stupid thing any marketing department has done in the history of time. And the key art is the absolute worst!
Considering the source material and the behind the camera talent involved, this should be a franchise of at least 9 films - but they've massively blown it. Hopefully clips like this will turn around the buzz and get people out there - if done properly this deserves to be as big as Star Wars (the original, not the prequels).