[PicardsFlute]

I can answer that as I own a Z9 and was I am interested in the tech as well. Essentially, it is using a "Stacked CMOS" sensor that has a readout time of ~1/270 s. For comparison, the Z7ii is 1/30s if I am remembering correctly. Essentially, it just reads out the data on the sensor fast enough to hide any shutter artifacts (with the exception of LEDs, but this happens even with mechanical shutters as well, and isn't that big of a deal)

The only other camera from the big 3 flagships that matches this speed is the Sony A1 with 1/250s. The Canon R3 is 1/180s. It has a mechanical shutter, but I think the Z9 proves that its worth the omission in 99% of the shooting scenarios. Especially when it is coming in $1000 cheaper than the Sony.

Edit: I was beaten to it!