I tried that, and got compiler errors, indicating the pins are already defined.
Tried going to the pin definition file, changed the pin number, but unfortunately no dice.
I also tried just copy/paste the pinout you provided, and while it still compiled, I get zero output now.
I tried just changing the SS pins to 28, but also no luck.
It seems it has two different SPI_SS pins defined, but it’s labeled as not pinned out:
#define PIN_SPI0_SS (31u) // not pinned out
// Not pinned out
#define PIN_SPI1_MISO (31u)
#define PIN_SPI1_MOSI (31u)
#define PIN_SPI1_SCK (31u)
#define PIN_SPI1_SS (28u)