Wild DoubleEnder bush plane - photo

[FEM2008]

I don't think that's correct. Thrust acting to push the plane forward from up high, and drag acting to pull the plane backwards acting down low at the wheels will cause a net torque that causes the plane to nose-down. It's not just a sum of forces pushing forward versus forces pushing backward. It's why the 737 Maxs were a failure. They moved the engines up higher which caused a net torque on the airframe that dipped the nose down as thrust was applied.

I see that the flaps are down but I cannot see the elevator very well. From the shadow, it might actually be down, which would aid in toppling the plane over. However, in the video link below, at about 3:37 mark, you can see the pilot alternating between up and down elevator a couple of times to keep the nose up after the wheels hit the water. It definitely looks like a risky maneuver, but bush pilots are some of the best around.