If the ocean side didn't have another garage door but a solid wall, would the outcome be the same . And if the lift was secured better and deeper into the concrete,would that of held it better..would like to see how the lifts held up.

wonder what happened to the two that were under the lifts ?

Here's the owner talking about it:

https://youtu.be/Kbf2LfBlqis

The codes in the Florida hurricane flood zones now require the living space to be elevated. I think it is 12 or 14 ft now. The space underneath can be enclosed, but the walls have to be designed to wash out so that the force of the moving water doesn't knock the structure over. Also you can't put your electric service panel in the lower area and you can't have any openings into the sanitary sewer. So the ground level is supposed to be considered a disposable, temporary space for garage or recreation room or something that could disappear in a hurricane.

Guess he stayed put and didn't want to "leave" his cars!
NOW his cars will be "leaving" him.

That's a 12 Million dollar home. Fixing those will likely be small potatos for that owner.

Yeah.....leaving to go to a restoration shop and get fixed good as new. I'd say the dude has the money to do it out of his pocket and not even file insurance.

WAG that the storage rack was not properly connected with substantial anchor bolts and maybe no footing to retain anchorage.
Storm surge and tidal action worked debris through the garage doors and acted as battering ram on the uprights. There is no sheer designed into the straight legs and with the weight of two cars up high repeated back and forth tidal action may have worked it to failure.
It would be interesting to know how high the surge was there and to have a look at the steel members, the fasteners, the garage doors (were they simple plywood to enclose a balloon foundation to locate home above flood level) and also the attachment to the slab (that appears to still be in place).
It does suxx, I've had to leave our home on several instances with sprinklers running as wildfires approached. Fortunately left no vehicles behind and never had a loss.

Storage racks were not designed for tidal forces but would be a simple upgrade. Bet the owner fixes the problem this time. There are a lot of situations where guys could add a lot of strength to their racks by fastening them together or to the walls. Doesn't take much, just some steel straps or angles and then they'll ride out an earthquake or flood.

Properly sized members, plates and fasteners supplemented by gussets and proper footings would be a good start..
Bolting it to the structure introduces a new situation that could be properly designed. Certainly owner knew the risk of leaving them behind.
I've looked at different lifts and "racks" The budget models generally are not steel shapes, rather fabricated or bent shapes.