This reminds me of the Moniac and hydraulic keynesianism

https://en.wikipedia.org/wiki/Hydraulic_macroeconomics

One past thread:

Vladimir Lukyanov's hydraulic computer - https://news.ycombinator.com/item?id=18525534 - Nov 2018 (72 comments)

Kind of related but not directly:

MONIAC – Monetary National Income Analogue Computer - https://news.ycombinator.com/item?id=18843255 - Jan 2019 (6 comments)

The Water Computer (2016) - https://news.ycombinator.com/item?id=18846599 - Jan 2019 (26 comments)

MONIAC, a hydraulic computer that modeled the economy - https://news.ycombinator.com/item?id=9812721 - July 2015 (6 comments)

MONIAC: an analogue computer using fluidic logic to model an economy. - https://news.ycombinator.com/item?id=4438081 - Aug 2012 (1 comment)

Somewhat off-topic, but the philosopher Tim Maudlin conceived of a water-based Turing machine for a thought experiment.

https://www.andrew.cmu.edu/user/kk3n/80-300/madlin1989.pdf

It’s Terry Pratchet’s Glooper.

https://wiki.lspace.org/Glooper

Close, but as detailed in your link, Glooper is closer to MONIAC - links by dang in sibling to your comment.

Some people are just on a whole different level.

Steve Mould has a video where he built logic gates using water: https://youtu.be/IxXaizglscw

Too many leaks.

Imagine using the metal of a T-1000 as the 'water', and another T-1000 as the 'computer'.