Just to add a bit more....each pixel of the sensor picks up data on each of 3 channels (R,G,B) and it also picks up 12 bits per channel.

The sensor does not differentiate between a noisy image...or a non-noisy image...the data from each pixel is sent to the computers processor.  Data is collected from all the cam's pixels....each pixel provides the same amount of data regardless of scene.

The sensor doesn't care whether that data is noise...or apple pie....the data gets collected.

If your sensor is NOT picking up this data...you have a problem.

In youth, we learn....with age, we understand.