If you buy the first series of something new, you are the Beta tester. That's the way these things work. I recall a John Cadogan video where he gave a very strong recommendation not to buy the new 300 for a while, to let them sort out the issues that will arise.
What I wonder is why he has this engine (and apparently 2 more) in his shop. Normally, a new vehicle, under warranty, with an engine failure, would result in the dealer removing the engine, replacing it with one from the manufacturer, and then shipping the old engine back to the manufacturer for examination. Yet he has three failures apparently.
So that leads to the possibility that there is no warranty on these 3 engines. Why would that be, I wonder? Have they been chipped, tuned, or otherwise modifed in some way? How had they been used when they failed, and how good were the service histories? He provides no detail whatsoever about any of that.
Now I am the furtherest thing from a Toyota Fanboi you would find, but there is nowhere near enough detail in this to make any determination about the cause of the failure.