I like the idea of showing the dinosaurs in their natural habitat and time, but still have big issues with this scene.
Giganotosaurus and T-rex didn't live together. Also, if they did, then although the giga is taller, the T-rex was more stocky and had the stronger bite force. In fact, a T-rex had the strongest bite force of any animal in existence. It could crush through bone like they were bread sticks.
In a fantasy world were the giga and T-rex were competing for food, the T-rex wins.
Like the design of the giga. Looks really horrifying, which it probably would have done in real life as well!