If anyone is to say "life is just slime on a planet", I'd mostly read into it as how insignificant life forms on Earth really are to the entirety of the Universe.
So, to me, the entire article is arguing a non-point: that's how I would read into the Hawking's statement. It's not about the beauty or complexity of life (or lack of it), but how even such complexity pales in comparison to the vastness of universe itself!
While life as we know it might not exist elsewhere in the universe due to a set of conditions required for it to evolve in such a complex way, there is likely other similarly awe-inspiring stuff (slime or not) throughout the universe — but, we are likely never going to experience any of it, with how restricted we are to existing within the boundaries of our little planet.
The universe is full of RNG generators, until we find another entity with the structure requiried to make semantic assertion about the universe I'd say we shouldn't be too hasty in saying we aren't that important.
We take energy and spit out complex semantic meaning, there are huge structures that take in matter and spit out stars but how many places have structures that take inputs and spit out complex semantics? Not many that we've observed so far and those ones are kind of in a precarious situation.
We haven't fully explored physics yet, I'd say it's too early to call it at this point.
Casual chains are fragile, we should preserve the structures that enable the generation of complex semantic meaning.
Unless we find the "slow life" whose basic building blocks are stars, galaxies, or even galaxy clusters.
Now that would be a sight.