I think that's over now right? I haven't seen this offered anywhere yet. Even if the article states it is still a thing, I still don't find any game like that on my usual online casinos.
It seems to me so complicated for a casino to offer a slot in this genre, it seems to me almost contradictory with the primary purpose of slot games.
Anyway thanks OP, it was a very interesting article, I will try to find more resources on this subject
I don't think it's over but it is more like it isn't very popular or widely used, and it might only be available at some land-based casinos for now. The concept sounds pretty interesting but we can't really make any judgments before we witness it ourselves since it isn't available on online platforms, it's difficult to understand how it actually works.
I've not checked yet but maybe there are videos available about it and its gameplay on YouTube or maybe on social media channels. I will try if I can find some because I'm also curious to know how it really works.