An argument from ignorance would be more like "I have never seen anything supernatural. I don't know how it could work. Therefore I conclude it's impossible."
The fact that we are ignorant of how the supernatural would work may constitute evidence against the supernatural, depending on the model you're using to interpret things. But as a logical argument it's not sufficient.
The fact that we are ignorant of how the supernatural would work may constitute evidence against the supernatural, depending on the model you're using to interpret things. But as a logical argument it's not sufficient.