Indeed, this would be an aesthetic issue more than anything else; whatever is picked would be ignored. I think this simply comes from the drive picker which is usually there for other install paths, and doesn't get hidden in the EFI case.
Adding bitesize tag, someone may be able to pick this up easily enough to implementing hiding that dialog (provided it's indeed the right thing to do).
Indeed, this would be an aesthetic issue more than anything else; whatever is picked would be ignored. I think this simply comes from the drive picker which is usually there for other install paths, and doesn't get hidden in the EFI case.
Adding bitesize tag, someone may be able to pick this up easily enough to implementing hiding that dialog (provided it's indeed the right thing to do).