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From: Pi

To: Pi

Subject: Project Time Machine - Test #3

It sounds like someone's trying to create some fun meta-fiction - it looks like a letter from the creator's future self to his past-self, describing future-self's experience going through some iteration of the time-loop ("Don't talk about fate. You did it once and it was cringy.")

Indeed - using the Czech-language version of Word and email client.

I believe that’s just part of the joke. It’s a mock email from the future, telling him what the URL will be and how to make the video.

In another comment, someone says the trick here is to do a resumable upload.

The document is covering the sign at the start of the video, so the uploader could have uploaded that section (without any text on the sign in-game), then "resumed" the upload with a different video that contains the URL on the sign and starts after he switches to the Minecraft window.

Except that the email at the beginning has the URL in it

Those look like "show notes" for the video creator to cover/notes to themselves.