There is a problem with that understanding.
In biblical Hebrew, you also have to look at the verb that follows a plural noun. If the verb is plural, then, indeed the noun is plural
If the verb is singular, then the noun is singular, but the importance of the noun is magified. For example, Moses was refered to as a plural noun, but a singular verb afterwards. This does not mean that there was more than one Moses, but in that passage, the importance of Moses was magnfied.