The cable/connector does indeed look interesting, if easily available ... possibly with more pins... I wish they had more details, from the thumbnail[0] they posted of the board edge PCB footprint, I don't see how it could be reversible... The short finger (presumably VDD) would need to be on opposing sides top and bottom, and it's always on the right. Or is my thinking messed up?
[0]: https://microsoft.github.io/jacdac-docs/overview/connectorca...