I REALLY hate this guy. Sensationalist crap. This video is making the rounds. I stopped watching once he started doing the teardown. I know at the beginning, he does not mention the tuner. Does he ever?
So much more to the this.
1) Who is the Tuner? There are MANY documented crap ones out there, that disable many of the Ford safeguards like the Knock Sensors.
2) Was he towing on a performance tune?
3) Was he testing his E85?
4) Was he regularly doing more maintenance?
Saying because one motor went boom on an "Aggressive" tune, tells you nothing. Very detailed on everything except what matters.
The 3.5 can handle a substantial amount of power over stock and maintain longevity if done properly by a good tuner, if they leave safeguards in place. Period. Our 2020 is 40K in with tune, and zero issues. Runs E85 for 5 Months out of the year, and a hot 93 tune the rest. If I tow with it, I tune to a tow tune.
Most likely this was a combination of owner and tuner fault. I haven't heard who it was tuned by, but I am sure it will come out at some point.