We were warned a long time ago.
"Day by day and almost minute by minute the past was brought up to date. In this way every prediction made by the Party could be shown by documentary evidence to have been correct; nor was any item of news, or any expression of opinion, which conflicted with the needs of the moment, ever allowed to remain on record. All history was a palimpsest, scraped clean and reinscribed exactly as often as was necessary."
- George Orwell, 1984, Book 1, Chapter 3
The "Reinscription" continues--
The Party slogan was
“Who controls the past controls the future;
controls the present controls the past."
This was where “doublethink” came into play,