Your logic isn't really valid. It could be that the glue is indeed effective in facilitating waterproofing and was put in place for that reason, however not to the extent that Apple wants to make any promises that it will survive being submerged.
I don't know what the truth is, I just disagree with your conclusion based on the logic you present.
I don't know what the truth is, I just disagree with your conclusion based on the logic you present.