Sorry for delay - it was weekend plus I had to recreate your block myself, as block in your drawing sometimes behaves in a strange manner in AutoCAD for Mac.
Anyway, in the attached drawings you can find two versions of your block (both of them works fine in AC 2018, but don't work in AC 2016):
- in the "grondverzet-000.dwg" there is "grondverzet" block, which I created with this method. You can copy already inserted block and change CURRENTLEVEL and NEWLEVEL attributes values, after REGEN the RESULT attribute updates automatically. But if you will insert block with INSERT command, you will be able to make it work only after you create new Formula field for RESULT attribute (which is impossible in AutoCAD for Mac)
- in the "grondverzet-0000.dwg" there is "grondverzet-1" block, which I created with another method. You can use INSERT command to insert block to the drawing area and it will start to work after you will change scale of the block with dynamic grip (this method uses "dynamic block" trick to force RESULT attribute to start working properly, an your block, fortunately, already has dynamic set).
As I wrote before both blocks work in 2018 version and not in 2016 version. Plus if you will try to edit Formula field in RESULT attribute in AutoCAD for Mac, the blocks will loose their functionality.