These information are incorrect. I think this was the case in the early BETA phase. I just received a brand new switch and the default PW is on a sticker which comes with the product itself.
Please check the Quick Start Guide on page 6 (5. Sign in to your Sophos Switch): https://docs.sophos.com/nsg/hardware/quickstart/sophos-quick-start-guide-switch-series.pdf
Let me know if you need further input.
BTW: I was not able to select "Switch" as category here in the product feedback section. It's missing.
Thanks,
Stefan