Hey,
He means that the notes haven't been snapped to the grid in the sequencer on which the track was created.
What themucka is referring to is time signature: 4/4 is the standard signature for hip hop, techno, rock, etc.; more complex music genres use odd signatures like 7/8, 5/8, 12/8, etc, which are very difficult to mix with the standard 4/4 signatures on most dance tracks.
Take care,
Nick