It doesn't have to be coerced tho.
Imagine a situation like this.
Efreeti A- Our position is about to overrun by a shitan flying column. What shall we ever do.
Efreeti B- OH I know, I wish that a completely nonmagical rock hits their ward stone at supersonic speed, starting outside their wards range.
Efreeti A- oh yeah, make sense. Wish granted.
Shitan force explodes.
The force which the wish produces to hit the wardstone cannot be non-magical, it was made by the wish so it will fizzle against the wards. Just adding the words 'non-magical' you your wish does not change that