Isn’t it the complete opposite? i.e. high automatization means that a single worker can create many times more value than before. However it reduces the demand for labor and worker bargaining power. So companies have no incentive to pair “fair” wages.

That is true but likely only temporarily. Why is the single worker even needed?

We tend to have a pretty human-centric worldview so if there's a single human working to keep a hotel running, our default is to attribute all the generated value to them when it really isn't the case. You can imagine that hotel at some point in the near future goes from requiring 1 worker to keep it running to zero.