To my way of thinking the AD/PZL/5 should have required the wings were removed for the inspection.
I agree that unless you see the front face of the attach bracket, the chances of picking up a crack are greatly diminished. But I guess it may be possible to unbolt the wing and either slide it outboard 50mm or raise it 50mm to gain access to the attach fitting without technically removing the wing.
Its been many years since I've done eddy current or magnetic particle inspection, but the small amount of refresher reading I did this morning suggests that eddy current is not recommended for detecting cracks within bores (holes).