In general, that term is used to refer to a skater using more than a small section of the ice when they compete. Good ice coverage means that they use all or most of the ice space that the rink offers. The ideal has been for a skater to "cover the ice" well, i.e., use most of it when they skate, and to do so with good speed and without an excess of caution, i.e., to appear free and effortless as much as possible, and to skate in what one might call a large way, resulting in a skate that is big, bold, and beautiful.
Thank you so much for your detailed explanation!!