This is true with ALL of the Snapmaker 2.0 models. The firmware on all of them is set to 212.21, and that is why e-step calibration is one of the very first things the community recommends to do as soon as possible.
There are several reasons they intentionally use the number they for an under-extruding e-steps…
The true e-steps calibration is specific to each individual extrusion motor (example: my original print head had an e-steps of 254, while the second one I have is 223).
Under-extrusion is safer (lower likelihood of clogging).
For beginner users, under-extrusion is easier to work with and more visually pleasing (prints look less messy for a machine and print settings that are almost certainly not yet fully calibrated).
All 3D printers require some sort of user calibration for near perfect accuracy; e-steps is one of those required for the Snapmaker, but is not entirely necessary for beginner users who are just getting started.