I don't think this is a good article to reference due to the differences in the motor setup between the older S and the current powertrains. The Y uses induction motor in the front (same as the older S) but the permanent rear magnet motor in the rear. The S uses induction motors front and rear for their long range version.
To answer your question in the first point, the front induction motors on the Model Y dual motor typically are not active until you get a little more aggressive with the throttle, activating at approximately 20% throttle. In normal cruising situations with the throttle being less than 30% (bottom, blue graph line), the front motors are not active/not generating torque. If you look at my datalog below, you can see the front motor (pink) in the top graph not generating any torque until the throttle position is greater than 30%. It'll also activate when there's slippage detected on the rear axle.
Although my graph chopped off the regen data, you can see that the rear motor (teal line) is doing the vast majority of the regen regardless of the conditions.
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