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Ironically, while I agree with the thrust that Windows Defender is basically good enough, I find it extremely dubious for a security-focused article to suggest that anyone should be in the habit of copy-and-pasting arbitrary inscrutable code onto their machine in the service of making it safer.

too little actual explaining of anything that would matter.

This. It reads exactly like (suboptimal) code comments or commit messages explaining what gets done but no trace of why. Why does this stuff harden defender? Why does it make Defender enough?

That script is a well known hack to get Pro/Enterprise features on Windows Home version, in this case the Group Policy Editor. Not necessary for most users.