Hi, I was the original developer of that extension (though I had to create a new Matomo forum account, old one I couldn’t get in to!)…
Yes, you are correct, that was a limitation of the old version for OC 2.x - however it did have most of the code for it, just hidden behind an if (false) { because I hadn’t tested it enough at the point of release, so you could find that and manually change to (true) and it should work with the old version, but in a limited way as I think I added it for Category views, but not for Orders.