alt Hacker NewsYou can see the pillars they are built on in for example https://www.bloomberg.com/news/articles/2022-05-13/china-s-s...
(direct link to image: https://assets.bwbx.io/images/users/iqjWHBFdfxIU/iy93Jvbye2e...)
Solar panels are meant to be water proof, after all they are meant to survive rain storms and melting snow and coastal weather.
"meant to survive rain storms" doesn't really mean the same as "meant to survive flooding", especially not "meant to survive flooding with salt water". For example, a car survives outdoor weather year-round, but you probably wouldn't want to buy one that was submerged in a flood zone. This plant seems to be floating, though, so they stay above water regardless.