I can imagine the script they've created removes certain DLLs/EXEs (and disables Windows Updates - which is a red bloody flag) but there are numerous ways in which this can break Windows down, so the whole topic is a load of poo and nothing else.

Do not use, do not download, do not touch.

It's based on the premise that Windows is spying on you which has never been proven/shown in the first place. Yes, Windows 10/11 send a ton of DNS queries - it's _not_ spying. Yes, Windows 10/11 send mini crash dumps and EXE files hash sums to Microsoft - that's _not_ spying.

It removes certain executables, instead of just changing some settings or registry values.