The code sample from Ido on that page only tells you if Adblocker is active or not.
I found a way to detect if an adblock is enabled or not. Simply try fetching an ads javascript file.
Note that this code must be executed in frontend code
Add a text element and set its text to “Adblock is ON”
Then add the following code:
import {fetch} from 'wix-fetch';
$w.onReady(function () {
fetch('https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js', {
mode: 'no-cors'
}).then(() => {
$w('#text1').text = "Adblock OFF";
});
});
You will probably find that a Adblocker will block any lightbox popup until it is turned off, so you might have to use a simple hidden box on your actual page itself and not try to use a lightbox which will not be opened.
You can see how to do it here.
You can also see this page about it too.