Just because you can't objectively measure amount of love between two people, doesn't mean it's invalid theory. You are overthinking this too much, using weird arguments and then try to push a narrative that says "anything that isn't standardized is meaningless". By the same logic, pretty much every psychological/personal trait is a buzzword that cannot be objectively measured, and so it's meaningless. It's intellectually lazy argument.
And no, empathy or ethics or emotions are not race-based (referring to your previous argument where it could be different between groups)