Calling anything that comes on a disk of vinyl an LP strikes me as having the same logic as calling my HP printer/scanner/copier a Xerox machine. It's an antiquated misuse of terminology that dates the user to a generation born before about 1970.
Poor analogy, I think.
And you are making up terminology that you think you heard used in a certain way when you were little...when the rest of us were already grownups. You cannot reach back into history and say something is wrong because it has been morphed into a different use or meaning by your (younger) generation. LP's and Long Playing Records are terms that came about in the 50's and 60's to describe vinyl disc products. You can use the terms anyway you want. But calling a tape or digital disc recording an LP is just silly.