Column group custom sorting doesn`t work with inline data

I`ve tried to make custom sorting with columnSort as method, it works fine with external data, but I use inline data loading and in that case data is not sorted. You can see it in example below(columns should be sorted in desc order). I need to sort complex objects and need custom sorting function, simple example with desc sorting was given just for description of a problem.
https://snippet.webix.com/r1p2mu6z