How to force a specific software to use proxy?

I flagged an answer as NAA, and my flag was declined:

flags should not be used to indicate technical inaccuracies, or an altogether wrong answer

However, that answer is now deleted.

What's wrong with my flag, if that answer is now deleted?

(And if someone could kindly post a screenshot of that answer and comments)

How to force a specific software to use proxy?

I flagged an answer as NAA, and my flag was declined:

flags should not be used to indicate technical inaccuracies, or an altogether wrong answer

However, that answer is now deleted.

What's wrong with my flag, if that answer is now deleted?

Here's an image of the post in question: