So many throwaway accounts. Anyway. You can probably achieve the same effect with the Remove-AppxPackage Powershell commandlet if you really want. I will also note that this "toolkit" is not just a bat file and also includes lots of cab files and other things as well.

These kinds of toolkits have existed since Windows 7 at least (NLite and friends). Some are the equivalent of putting go-faster stripes on your car, some actually work, some do things like https://twitter.com/SwiftOnSecurity/status/75879678600154726...