Earlier quoted context omitted.
I mean that the essay is not written in the fictional world of 1984, but in the real world. It's outside the work of fiction, a piece of literary criticism by the author of the work being discussed.
When I first read 1984 I also thought like you, that this was just Orwell writing an essay about his invention, but there are some passages in this essay that show it's being written from an "in universe" perspective, i.e. by someone who lives in the same universe that 1984 "happened". Just an example: > "Various writers, such as Shakespeare, Milton, Swift, Byron, Dickens, and some others were therefore in process of…
Alternate interpretations exist. Including:
1. Orwell's writing slipping between his voice and the "narrator in the scene"
2. General stylistic choice to follow scientific writings style guides - 3rd party, impersonal, etc.
3. General de-personalization of the voice of the System, so as to be more fearful
I'm sure there are many others I have missed. Again, my point is just that many valid interpretations exist simultaneously - so "once you accept this" is not the fait accompli that I interpreted from your comment.