This is referenced by the st7789 include in the demo c++ app
#ifndef NO_QSTR
#include “st7789_parallel.pio.h” // Dowsn’t exist
#endif
And eventually it tries…
pio_sm_config c = st7789_parallel_program_get_default_config(parallel_offset);
But can’t find it anywhere (extensive googling) apart from on a lone page at Pi Pico SDK Blink Copy - Wokwi ESP32, STM32, Arduino Simulator