“By default, macros are imported disabled unless you hold the Option key down. Importing them disabled is important, because otherwise this could result in the imported Macro being triggered (executed) as soon as it is imported. ”
Macros are always disabled when imported, but depending upon the states of the exported group and macro the disabled item could be either the macro group or the macro.
See this for more explanation:
Test for yourself and see.
I think the Wiki should be more specific, but I don't have time to fool with it at present.
-Chris