Not at all. He wants answers to questions that are both unanswered and irrelevant. So youre going to have to explain to me how it isn't irrelevant. You stated it but i am going to need you to qualify that statement..

if he finished the book he would know this.. historical ignorance is thematic in the book, explaining that any further is a potential spoiler, knowing the history blows apart the themes of the book. Orwell makes a point of making this both ambiguous and irrelevant.

If he wouldve asked "is big brother real? Do they ever go into detail about how he rose to power".. you would find similar answers for the same reasons. "Don't know and it's irrelevant and explaining that any further could potentially spoil the book for you so just read it". If Orwell were to give answers to these questions it would ruin aspects of the story completely.