I would suspect they are floating on pontoons.

You 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.

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gs17 an hour ago | parent [-]

"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.

	▲	Y-bar 43 minutes ago \| parent [-]
		Do you have any specifics about the implementation that makes you say that the engineers have not considered this?