It’s from the book “1984”, published in 1949.

Sadly you ignored the main takeaway from the quotation, "ignorance is strength".

Neither of these are applicable to the return of the War Department. This on-the-nose name for the department leaves nothing to guess about its purpose - war clearly is not peace and ignorance of that fact is not strength hence the name War Department instead of Ministry of Peace.

I’m pretty sure he’s quoting the book

On the other hand, I think anyone who knows when Orwell died should know Noneteen-Eighty-Four, so the comment should be seen as a joke, though it helps to give a textual signal like /jk