The short answer is no.
Range = High - Low
Having said that, one could try to substitute range with true range. Soul said he uses
Value Area High and
Value Area Low also. So I am thinking he gets two sets of numbers: the traditional %trend and the
Value Area % trend.
If that is correct, then I would gues one could get a True Range % trend.
***edit: Just wanted to add, that the tool is measuring market facilitation. That is, how effectively price moved thru the period. Or in a word, trend. Thus True Range may not be appropriate for the calculation. However, I could be wrong.