Use with caution, it breaks the phone system

After installing the release from here: https://github.com/xeddmc/terminal_systemizer/releases, as recommended in XDA forums.

I systemized 2-3 apps, and everything was fine, then I reverted one app back and it caused an infinite boot loop.
After fastbooting into recovery I noticed that the folders /system/app and /system/priv-app were deleted.

(Phone: Pixel 3a)