Theoretically you could use an esp32 device or aquara device or similar that uses a water/leak detector circuit and use it to trigger when the sensor reports dry. But you’d likely have to build & modify a sensor yourself for that use. Modifications would likely be necessary in order to not submerge the sensor, which could foul the sensor over time. Since many water/leak sensors are designed to conserve battery life by occasionally reporting dry then sleeping until water trips the sensor to report wet, using the sensor in reverse such that it’s always reporting wet until it finally reports dry might cause significant battery drain for the sensor.
I don’t think Grouchy was faulting you for trying to improve upon the idea, just noting that the system in this thread may not be the best jumping off point for your idea.