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I'm having a hard time confirming it (can't find the original paper w/o a link), but you are probably referring to mechanical stress instead of fluid pressure.

if you hang a tensile load of 1000 Newtons from a 1mm x 1mm rod, the rod is under 1 GPa of stress.

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Here's the original paper: https://www.nature.com/articles/s41467-019-09730-9

This is all I saw to address the pressures required:

> Our higher operating pressures do not represent a barrier for applications because they can be generated by a small load in a large volume of material via a pressure-transmitting medium, e.g., using a vessel with a neck containing a driving piston, whose small area is compensated by its distance of travel.

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