Do you actually read what you write or are you making this up as you go along ..................
I'm still trying to work out the point of your post ............. the Adiabatic is not used to work out the size of a bonding conductor directly, it works out the size of the protective conductor, which can then be related to a bonding conductor, once the main protective conductor is sized in a TN/TT system.
A bonding conductor in a TNC-S is directly related to the size of the supply neutral and can not be worked out by anything so where does the Adiabiatic come in here?
As the Adiabatic can also be used to size Circuit protective conductors I think it is wrong of you to tell someone it can also work out a bonding conductor, because it doesn't and that is poor advice, your basically trying to be smart, don't be with me son because you'll lose. I have yet to do it myself or any design engineer worth his salt work out a bonding conductor using the equation this way, your playing with words!!
As for your quote about PME systems, you know dam well that a PME becomes a TNC-S within the installation and you know as well that table 54.8 relates to a TNC-S why are you always trying to pick an argument, are you worried that people might not think you are any good?
Perhaps you intimidate some on here with smart replies, but son when I hang my overalls up at night they know more about electrics than you .