I apologize for informing you that the product planning is currently being adjusted, and further notification will be provided in due course.
This is the pinout information about the IO Expander for Xiao, the D0 pin has been circled in red.
More detailed schematic information is here: Xiao IO expander COMING, and Going.. Roll your own. ✌ - #18 by Citric
We appreciate your feedback and we will be actively updating the Wiki in the future.