In your "Steel Load" station screenshot, there's only one line, and one train arrival. (I though we could see incoming train contents, but by the reservation logic it must be carrying hydrogen), and there's enough room in that station to unload a full fluid wagon. It will incidentally still move other resources, even above/below threshold if it can.
The same is true for your "Oil Unload" station, it is full of Hydrogen, and the incoming train can fully load that hydrogen so it will visit, and provide any cruide oil it is carrying.
Only one condition among the station resources needs to have it's arrival rules satisfied to allow for receiving trains. There is no means to only allow trains to visit if all resource threshold conditions are met.