I think every digital camera, scanner and even the hdr cameras works in the same way.
An untouched raw file from camera or scanner is in linear light:
1)this is what camera see, in this stage is applied the corrections from the it8 target.
after scanning something you can output a linear file untouched

2)then this file need a gamma correction,yor scan DrDre is in this stage and probably silverfast makes his own adjustement for maximize the information in both shadow and highlight,this stage is good only for archival purpose and it is not really rapresentative of the original photography.
for example in silverfast you can choose the gamma correction (they call it gamma gradation) to use, you should insert the value of 2.20 because is the one used by all monitors and more “human friendly” :

3)finally the file need some contrast adjustment, every jpeg from camera or every raw editing software or scanning software apply a “base curve”, and this is what the human eyes see more or less, i know this is the more creative part of the process but is necessary

from your first scan:-)