This block of code, is currently pointless:

helper_get_columns_to_view calls the get_columns_to_view custom function.
This gets the default columns, then calls columns_remove_invalid on the set of columns returned by columns_get_all - aka column_get_standard + custom fields/plugins.
columns_get_standard reflects the bugdata object, and removes columns based on the currently enabled config options for the project. Therefore, before this code gets hit, the 'category' column will have been deleted.