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It looks like he was using a very long and rather narrow kayak. Those are easier to tip. I once used a friend's friend's sprint kayak. I've never tipped a kayak, but it was very easy to tip the sprint kayak. Any waves and that thing was almost unusable.

Most recreational kayaks are, like you suggest, almost idiot proof and can only be tipped if you're really trying.

The author must be talking about Sprint Kayak, which is incredibly unstable, must be in flat/calm water. Commercial paddling kayaks are incredibly stable, you have to try really, really hard to flip.

K1 (racing) kayaks are unstable and very narrow, most other types are fairly stable tho.

Depends on the waters you're moving in I guess?