August/September is tomato season in the northeast and central US.
Why are so many varieties red? Because marketing, same as apples. Much genetic engineering to come up with the amazing Beefsteak Tomato.
The first tomatoes were introduced to Europe from Mexico via the conquistadores. They were mainly viewed as ornamental plants. The fruit was the size of cherry tomatoes, and yellow-green when ripe. I guess that was the real "heritage tomato".
Why pomodoro? Pomo d'oro - Golden apple.
Why the Tomato Was Feared in Europe for More Than 200 Years
Italian food before the tomato. He is wrong about one thing - peppers came to Europe and to the world via Central America too. Same as polenta (maize meal), beans, and so much else.