Win7 PE - driver incection

[Nierewa]

check case and spelling of lines in ventoy.json  (e.g. Livesysteme  - captital L?  system ?)
if you look at your .7z file, does it have VentoyAutoRun.bat and \Windows at top level?
Check using Ventoyplugson  https://ventoy.net/en/plugin_plugson.html

I checked twice, all correct