What do you mean by "old fashion" room treatment, that's the only real way of getting the decay times down. With EQ you can basically just flatten the frequency response but the decay times will roughly stay the same or just be somewhat reduced caused by a little less energy in those areas.
When using room acoustic treatment you fix the problems where the source of the problems occurs, and that should in all circumstances (when that can be done) be the absolute first step to fix the problem, and obviously long before you reach for the EQ tool which is basically just a 2D tool trying the repair a three-dimensional room problem.
I'm sure you know all this. But calling room treatment "old fashion" indicates that you maybe think there are new modern ways of fixing the room decay times.
I'm not quite sure what you want to show with your comparisons between your Genelec computer setup, and Torbachkristensen's professionally treated studio setup. Tonality is just one single parameter among many, your setups will most likely not sound even remotely the same or similar.