Functions that write directly to a configuration section has been deprecated since 3.x.x, indicated in include/wiced_framework.h,
extern wiced_result_t DEPRECATE( wiced_dct_write_wifi_config_section( const platform_dct_wifi_config_t* wifi_config_dct ) );
although I must say it looks okay in WICED 2.4.1.
Use wiced_dct_write instead, along with the corresponding DCT locks and unlocks.
The thread you mentioned is locked, so can't post this message there