That functionality would be local, before the one-way isolator. A human at a terminal located near the valve could still press a button to make that happen. That system could even be running windows (most are!).

But a hacker wouldn't be able to use their access to the Timeseries database for supply chain and logistics, to pivot to the SCADA system because their attempts would be blocked by a lack of a physical layer connection in that direction.

It would significantly reduce the attack surface of the OT systems.