> The complexity of the sum total of a human life is so great that I think its folly to try measure the value at all

I think that's basically the same thing that the "Humans are Valuable" was getting at. Invaluable is just a different way of saying unmeasurable amounts of value

Right and words matter. Valuable is a relative term that asserts a measurable quantity and they're trying to assert something non relative and not measurable.

I don't take issue with their point. Just that we can use a stronger word.