A mill next to a river "consumes" the water that turns its wheel, but then immediately releases it back into the river. That's very different to a cooling tower that turns that water into vapour and releases it into the air. Which is the data centre doing?
Assuming the data centre isn't actively depleting groundwater, the only important number is how much energy it consumes (including for water related activities). Perhaps also power per unit of compute.
In a lot of places in the world, using water for cooling is likely to be more efficient than an equivalent heat pump - so should be celebrated!
It is entirely possible to run a data center with a minimal fixed amount of water if the cost of power and real estate are not a concern.
So from the practical perspective of everybody else who happens to need water from the pipe/aquifer/lake/snowmelt, it's "gone" just as much as if it were dumped into the sea.
If they actually pump free water from source around their location and release it back how they want to, the points about water consumption are definitely legit.