Banding on Z9

MCLV wrote:

As I described here https://www.dpreview.com/forums/post/65887363 , using mechanical shutter will blur the banding. For f/2.8 and assuming shutter location 4 mm in front of the sensor plane we get a diameter of light cone of 4 mm / 2.8 = approximately 1.4 mm. Therefore, blurring caused by mechanical shutter would be roughly 1.4 mm / 24 mm = 5.8% of image height and 1.4 mm / 24 mm * 2000 = 117 pixels of the original image. Hence, I simulated how the image would look if a mechanical shutter was used by applying a linear blur of 117 pixels in vertical direction. I then applied layer mask around Yngwie, so he is not completely blurry. You can see results below.

I'm trying to figure out the math and hope you can help me with that.

1. Fictional distance between shutter and image sensor: 4 mm
2. Diameter light cone: The outcome of 1. dividend by the aperture = 4 mm / 2.8 = 1.4 mm (rounded at 1 decimal)
3. The outcome of 2. revideer by the physical hight of the image sensor =
   1.4 mm / 24 mm = 5.8 %
4. The outcome of 3. x the horizontal size of the (RAW) photo =
   5.8% x 8256 = 478 pixels

So I need to apply Motion Blur at 90 degree of 478 pixels on the full resolution RAW file (and mask out everything that does not need to be blurred) to get the desired result.

Did I get the math (and where the numbers come from) right?