@chazrogers each tool has configurable offsets
https://duet3d.dozuki.com/Wiki/G10#Section_G10_Set_workplace_coordinate_offset_or_tool_offset
This allows you to have (say) 1 tool at 0,0 on XY and then another tool with a different offset when its picked up by a toolchanger. these offsets are applied as described in the documentation you quoted.