This is specifically using the built-in wade mode for the advertised boat truck, which on the Tesla website shows it safely going through up to 32in/0.8m: https://www.tesla.com/ownersmanual/cybertruck/en_us/GUID-1AD8BC96-CFD8-43B3-AF5F-9755BAAC8F3A.html

They definitely misgauge the depth of the entire puddle though. When they assess it and drive through the first part, it's about as deep as that manual shows the truck being capable of. Then they get stuck driving through the part that's maybe 1m~ or so. About here is where he fucks up and goes deep enough to drown any vehicle: https://youtu.be/4lKAEHMvvxg?t=327

In that regard I'm not surprised it fucked the vehicle. Driving way too fast through water that deep is something I would never do and even the initial puddle is about as sketchy as I've tolerated in a high SUV. I just think it's hilarious that the Cybertruck was specifically advertised as a boat since its announcement to the point that it's probably the only vehicle in the world with its own stupid beep boop mode for it, while the basic design of the chassis fucks the whole truck if it gets wet. A heavy storm will probably fuck these things as much as a car wash or a puddle or parking on deep snow.