A similar incident could happen with a packrafter on rivers here in AK or elsewhere: it's worth watching.
I take two lessons from it:
(1) This kayaker was unable to roll. Most of us will inevitably fall out of our boats, too. What do you have to hang onto your boat with? Consider putting six additional tie-down patches around your boat and tying onto each with a poly-pro hand-line. Don't rely on bungies stretched through the four, stock, bow patches or a dragging tail of webbing from the stern. You want what Brad calls a "guard rail" to encircle your boat. When you flip, you can just reach up and grab it from any point on the boat and it will feel so much better than the fat, slippery tube. Take it from a guy who's swum more rivers and creeks after falling out of his packraft than likely anyone. If you can't/won't glue the patches on yourself, then ask Alpacka or a local shop to do it. Alpacka really should do it on all their boats.
(2) One difference between packrafts and inflatable kayaks and hardshells and big rafts/catarafts is that we packrafters can flip our craft and get back in. This is a self rescue, and after the glue dries on your guard rail, get out there and practice getting into and out of your boat, preferably in moving water, but even in the deep end of a pool is valuable. Again, the unfortunate level of experience I have, due to the high frequency of falling out of my boat, suggests that the side-entry boats with codpieces are harder to self-rescue into than the old center entry. If you have an old center entry boat, don't send it back to Alpacka for a retro fit. Watch this blog here: I will soon post how-to make your old center entry boat dry.