Source is this video:
Windows Was The Problem All Along - Dave2D
We could obviously compare performance between windows and steamOS before on the steam deck, or between windows and Bazzite on other handhelds. But this is the first time we have had official windows and SteamOS builds for the same hardware.
This is only one half of the open source. Those scripts are not poweshell or bash scripts, but instead something simimar to Ansible, run through the Windows AME wizard.
Which I cannot find the source code for. Great!
I think this is the command line onlu version, but the GUI versiom appears to be closed source.