Correct, we don’t see what happened before or after, so we don’t know. But the idea that he reaches directly in the back pocket, pulls something out, stands up and immediately puts it in his pocket, then doesn’t continue digging through his pockets...
Which is why i believe it might have been the last item he takes out, or even possibly the only item Remco was carrying and Bramati "searched" his other pockets prior . If not, it would be even more damaging showing the footage that he
didn't do that right before pulling out this item. Now it is implied that he quickly takes this item and only this item, but if the footage had shown that he went to Remco to retrieve only this item, that would be much more suspicious and Vayer would surely have included it. Which leads me to believe, that the full footage, paints a different picture.
Vayer is implying Bramati takes out this item quickly before anybody sees it. But, at that time, the other DQT manager had already reached Remco and is sitting next to him, lifting Remco's head and keeping it steady, and medics are already present as well. So it certainly doesn't seem like DQT rushed down to retrieve this item. Furthermore, Bramati standing up is what probably looks most "weird" to people as if he just robbed Evenepoel. But if you think that, you should put on some jeans, crouch forward, and try putting something in your pocket... not happening. You need to get up to put something in your pocket.
This is all conjecture, of course. Just like the the assumption it could be something illegal.