Can you point to a specific time stamp in the video? Also keep in mind, following the ring mod, the sound is getting resonant filtered and delayed. I got similar tones I suppose using squares waves like the video says. In the vid, it says the mod osc is manually tuned, so don't cv that. Run it through a filter with a faster envelope (clock wise) than the 4 step sequence.
I wish I could hear it without the delay and filter. That's adding a LOT to what is happening.