I immediately notice an issue. This "survival mode de-tuning" does nothing to make the buoy less buoyant. And they showed it just staying (vertically) stationary in high waves. That'll reduce power output of course, but the problem is it'll also generate enormous forces on the anchor.
"survival mode" on a wind turbine involves pitching the blades so that less or no energy is being transferred to the blades by the wind, which slows or stops the blades. (that reduces the "interaction" between the wind and the blades) Turbines have a "maintenance brake" that can hold the blade still but it's nowhere near strong enough to hold it in a high wind without pitching the blades, and the wind will tear the brake apart if you try to use just that to slow or stop the blades..
The buoy appears to be trying to use a brake to stop movement, instead of doing something to reduce or stop energy collection, and all that energy you're collecting has to go somewhere. If all you've got is a brake, the energy will go into whatever the brake is holding onto, or start mechanically deforming the brake. It'd be like jamming a stick in the spokes of your bicycle wheel to stop the bike.
They're setting themselves up for a "if it doesn't bend, it will break" sort of situation.
The most obvious response would be to reduce magnetic coupling at the generator, which would allow the buoy to move up and down more easily and thus extract less power from the water. Sort of like adjusting power to the field winding on a generator to regulate the energy being produced. (that's not as easy to do with a wind turbine because the blades just go faster and faster until centrifugal force shatters the blades)
Or pump water into the buoy to make it less buoyant, thus reducing the interaction between the waves and the buoy which would reduce the energy being transferred to it.
But the animation is clearly showing the buoy stopping the arms (braking) and somehow not bobbing up and down as the waves interact with it, so there's a whole lot of energy being stacked up on the internal braking and the anchor as the waves apply a huge up-and-down force on a stationary buoy. Nothing's bending, and something's gonna break.
This kind of reminds me of "solar frickin roadways", where there were obvious design issues that somehow got ignored all the way to large-scale testing. I'd LIKE to see this work, but they need to address this design problem before they do large scale testing and find out the hard way that it won't survive as designed. It looks like right now they haven't done any testing in locations that pushed their "survival mode" anywhere near the level it's going to need to well... survive.