The zip file contents should be identical to the live website, aside from the post ordering, and the manual addition of the bottom centered line (from which this file is linked).
Clicking the email address link, and sending an email with subject 'emsurvival', will also generate an autoresponse containing the zip file link and SHA256 file hash.
These are step-by-step instructions to validate the /r/emsurvival subreddit archive zip file on Windows:
  1. Download the subreddit HTML zip archive from: https://www.emsurvival.link/emsurvival.zip
  2. Assuming default download location, open file explorer (press Winkey+E), and in the left pane, click 'Downloads', find 'emsurvival.zip', hold SHIFT while right-clicking the file and choose 'Copy as Path'.
  3. Open a PowerShell console (WinKey+R, type powershell.exe, press ENTER), then at the console "PS C:\...\>" prompt, type Get-FileHash then a SPACE, then press CTRL+V (or right click the console) to paste the path of the zip file. Press ENTER to generate the SHA256 hash value (default algorithm).
  4. The SHA-256 file hash value, as of 3/10/2022, should match: 187D6F1D82860B22B55998785F03C39FED1AC705547E0D0EA92A0539240B2759