Pir sahib nice try but sorry to say that the link you posted does not prove that it is proper use of those two words.
Here is a discussion on these two words from one of the forums which showed up using your link:
‘until’ is used when we want to refer to the time that an activity or event stops;
I’m going to work until 6 pm and then I’m going to go home.
Stay on the train until you reach Faversham Station, then get off the train and continue by bus.
I’ll love you until I die!
‘unless’ refers to a reason why something might stop or not happen;
I’ll love you until I die, unless you are unfaithful. If you’re unfaithful I will stop loving you and find someone else.
We’ll have the party in the garden, unless it rains. If it rains we’ll have the party in the house.
Unless you work harder, you won’t pass your exams! However, if you work hard from now until the exams, there is a good chance that you will pass them.
I hope this helps. Let me know if you’d like further examples or explanations.