That’s true in the same way as you are nothing else but molecules and some biochemical reactions.
It’s reductionist, and otherwise not a useful description of a human, tells nothing about interaction possibilities, lifestyle or lifespan for example.
It’s also not an accurate description, because “molecules and biochemical reactions” describes very very many life forms, just as “a computer” could be your smartphone. But aside from both being a computer, a smartphone is quite distinct from a cloud.