The sidekiq_core/inc/sidekiq_types.h defines overload as:
volatile uint64_t overload:1; /**< @brief RF Overload (1 bit) indicating whether or
* not the RF input was overloaded for the received
* sample block */
In Streaming.cpp the overload is being treated as if it means overflow. There is an error message that gets returned when you call skiq_receive that will indicate there is an overrun, which from the logic I believe that is what you are trying to catch to reset things.
skiq_rx_status_error_overrun return check will give you the desired functionality. The way the logic works right now, it will reset buffers prematurely when overload state occurs, which is when the RF input is in excess of 0dBm.