No, sorry. I’m not talking about the Ixora but rather the Apalis TK1 datasheet (https://docs.toradex.com/103129-apalis-tk1-datasheet.pdf - page 33, chapter 6.2 GPIOs).
So basically Apalis GPIO1 is NVIDIA TK1 ball/port FF2. And now looking that one up here gives us number 250. And that’s what you should use on the kernel/sysfs level.