[hojjat12000]

At the bottom of that page it says:

"Proposed preface to Animal Farm, first published in the Times Literary Supplement on 15 September 1972 with an introduction by Sir Bernard Crick. Ian Angus found the original manuscript in 1972."

So, I don't think this was written during WWII.

[int_19h]

Animal Farm itself was written in 1943-44.

The essay I linked to was written in 1945 - if you read it, it actually talks about the ongoing war etc, e.g.:

"... we are allies with the USSR in a war which I want to see won"

It wasn't published until 1972, for exactly the reasons Orwell outlines in it. Indeed, publishing Animal Farm itself was hard enough - many American and British publishers refused to do so, on the ground that the book clearly satirizes the USSR, which was then a war ally.

https://en.wikipedia.org/wiki/Animal_Farm#Preface

[tablespoon]

> So, I don't think this was written during WWII.

If it wasn't, it was probably written very soon after the end. It uses "this war" to refer to WWII and it doesn't appear to discuss anything post-war.