My partner lamented the same thing... Cray was doing this 40+ years ago

Cray used Fluorinert, a chlorofluorocarbon. So not exactly a environmentally friendly solution.

That shouldn’t be a problem then given that we don’t care about environmental impacts anymore.

Bad quality of water clogging the pipes integrated onto the PCBs (thus requiring to replace the PCBs) was said to be what were killing those few USSR Elbrus supercomputer installations.