Yes, both JScript (not the same as JavaScript, BTW) and VBScript are still supported and both are included in modern Windows versions.
The project is still somewhat useful because it runs on any OS, not just Windows. It doesn’t use ADSI, it relies on this instead: http://ldapjs.org/
However I would strongly warn anyone considering using it to do massive amounts of testing in their real production network. Implementing against the current version is easy, but lets remember: this is a protocol old enough to buy cigarettes. It not only changes in behavior between versions, it also has edge cases where things behave differently when the version you are running is an upgrade. Or an upgrade in progress. Or part of a forest that also has... etc.
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I have to say, other than setup and lack of permission handling the js lib has, I would find myself preferring it