Your point is well taken.
I did watch the video. But not all of it. But I do believe that part of the arrest process was taken in front of fast food sellers and vendors AT THAT VERY TRAIN PLATFORM.
Which begs the question: Why sell food that one is not allowed to eat?
I don't know. Maybe there's a designated area to eat and he stepped outside the area. Maybe he walked up to the platform where the train was going to stop and transit officer believed he was going to get on the train with the food.
I once watched a guy standing at a bus stop eating a box full of chicken wings.
When the bus arrived he dropped the box, the bones, the uneaten wings, and napkins on the sidewalk where he stood and got on the bus.
If there was a trashcan at the stop I don't believe he would have made an effort to walk over and put his trash in the can. The world is his trashcan.