Now is time to have some fun.
For this test I closed again the enclosure with the Lattepanda inside with a humidity sensor and a battery.
I used a profesional splasher machine, aka water flosser.
As you can see in the video all of the connector maintain the waterproofness and there was not water ingress in the enclosure.
I found that the humidity sensor output could change if you change the orientation of the sensor but the change is minimal, it was a increase of ~2% but based on previous tests a water ingress generates a increase of >30%.
I think this was a successful test. Even that I'm not using the correct cable size, but I prove that some tape or heat shrink tubing could improve the sealing in case of using a smaller cable size.