The difference between Buzz and Renoise, with regards to the first video posted, is that Buzz supports aliasing “pattern blocks” of a different length, while Renoise will truncate (or insert but not extend) aliases to fit into the current sequence size. Short version: The Pattern Matrix doesn’t have “polyrhythmic” support.
If you want something like that, there’s Grid Pie, but it’s a midi controller tool for live improvising, not a keyboard driven composition workflow.
For now, it’s not possible to do what you are asking. Simple. The end. Is there room for improvement? Sure. Just like the attitudes in this thread. I agree there is room for improvement.
But, you can’t deliberately ignore that, in Renoise, a Pattern is always part of the sequence. It’s either there, or it’s hidden, but it’s always stored in the timeline. It’s based on the principles of pretty much every tracker in existence except Buzz. Buzz has decoupled patterns that aren’t in the timeline. This is not the norm. Even Impulse Tracker’s decoupled approach is not “polyrhythmic” as far as I remember. If you can’t wrap your head around this no one can help you.
There’s only one Buzz, and it’s not Renoise.