"Do Not Track" is enabled since IE9, it has nothing to do with the platform?!

For dnt_helper.js in node.org, I've noticed there's a snippet of codes to tell whether the user has enabled dnt tracker or not, some of them are (take key parts):

function _dntEnabled(dnt, userAgent) {

'use strict';

// for old version of IE we need to use the msDoNotTrack property of navigator
// on newer versions, and newer platforms, this is doNotTrack but, on the window object
// Safari also exposes the property on the window object.
var dntStatus = dnt || navigator.doNotTrack || window.doNotTrack || navigator.msDoNotTrack;
var ua = userAgent || navigator.userAgent;

// List of Windows versions known to not implement DNT according to the standard.
var anomalousWinVersions = ['Windows NT 6.1', 'Windows NT 6.2', 'Windows NT 6.3'];
.....

// With old versions of IE, DNT did not exist so we simply return false;
......
} else if (isIE && platform && anomalousWinVersions.indexOf(platform.toString()) !== -1) {
    // default is on, which does not honor the specification
    dntStatus = 'Unspecified';
.....
return dntStatus === 'Enabled';

}

It seems that since IE9, we've got "Do Not Track Me" function. And in IE 11, it'd be 'Windows NT 6.3'. So I suspect whether it has nothing to do with the 'platform'.

Now take IE 9 as an example:

As for IE 11, we've automatically enabled this here:
https://support.microsoft.com/en-us/help/17288/windows-internet-explorer-11-use-do-not-track

I'm not sure whether this is a bug in the codes, but IE9 (since) has really started this function. I suggest we should take the IE version (>=9) as a level to check whether we've supported dnt or not?

What do you think of this?

PS：Checked all the browsers, the result of dnt is:

For borwser dns support info, plz see: https://testdrive-archive.azurewebsites.net/Browser/DoNotTrack/Default.html

No problem, I misunderstood what the codes mean：You wanna set when automatically DNT = 1, ignore it. I closed this.