The “Redstone 8” label is fictitious – may be an attempt to mimic old Windows 10 naming or imply a later “unreleased” update.
The "x64" designation confirms the environment is strictly 64-bit. This is a necessity in modern computing as the industry has moved away from 32-bit UEFI firmware support. This allows the PE to utilize the full register width of modern CPUs, enabling it to run heavy diagnostic applications (like Acronis or Macrium Reflect) that require significant memory addressing.
"Gandalf 39-s Windows 11 Pex 64 Redstone 8 Version 22h2" appears to be a label for a custom or repackaged Windows 11 distribution. It combines several elements commonly used in unofficial Windows ISO names: