alt Hacker NewsThere are a lot of problems with the article, but this isn't one of them. The history of science has been one of dispatching one irreducible "essence" after another. Essence meaning some essential property of a phenomena that defines it and distinguishes it from all other phenomena. Science is in the business of reducing these once seemingly irreducible essences to more basic structure and dynamics. The last hold out is consciousness. It's reasonable to think it will also fall eventually.
It absolutely is a problem with the article. Science deals with physical phenomena; metaphysics quite literally means beyond physics. It's ridiculous to say that consciousness is the last hold out, as if there aren't a million other unanswered questions about meaning, essenence, and experience.
Here is a parallel argument for you. The history of science has been one discovery after another which leaves us with new, increasingly complex unanswered questions about phenomena. It is reasonable to think that if/when we reduce consciousness through science we will find that there are more increasingly complex unanswered metaphysical gaps.