This question essentially has a yes/no answer. From responses so far it seems like the answer is 'no', and the only way it could be 'yes' is if someone has specific knowledge about NuGet processes that I do not have, which would be objective and verifiable information. I can't see where opinion comes into it.
How can I be sure that an unofficially uploaded NuGet package is genuine?
All it took was a few minor edits to make the question into something that could be reopened.
First, I changed the yes/no to an explicit how/why question. It may not seem like it's important, but it is. A question that is clearly asking how/why tends to attract better answers. Questions that ask yes/no questions tend to attract drive-by answers that don't explain how or why. Having a title that is a yes/no question attracts low quality answers and it's easier to put a question on hold than to monitor answers.
Second, I removed a question inside the body that asks about what NuGet does. We aren't technical or customer support for someone else's product, so we can't answer what they do or don't do. Also, their policies may change at any moment in time, so it helps to ensure that answers stay more relevant if we don't get into organizational policies and rules.
