Underwater pods are the polar opposite of space in terms of failure risks. They don't require a rocket launch to get there, and they further insulate the servers from radiation compared to operating on the surface of the Earth, rather than increasing exposure.
(Also, much easier to cool.)
But they didn't say just "gravity", they said "gravity well".
> "First, let us simply define what a gravity well is. A gravity well is a term used metaphorically to describe the gravitational pull that a large body exerts in space."
- https://medium.com/intuition/what-are-gravity-wells-3c1fb6d6...
So they weren't suggesting that it will be big enough to get past some boundary below which things don't have gravity, just that smaller things don't have enough gravity to matter.