You can pretend words mean whatever you want em to, but that’s just not how it works.
Yes it is. Words mean whatever to whomever is using them, and to whomever they are communicating with. I was not communicating directly to you, therefore I was not holding myself to your standard of definition.
Words change over time depending on usage, and there is no dictionary definition regarding whether the word “seen” is defined as meaning “all” or “in part”, nor if in part how much in part or of what part.