I watched that video and noticed two things:
1. Five engines didn't fire and it still got off the ground in a big hurry.
2. The rocket appeared to hold together at a high rate of speed even while "flipping" That seemed pretty remarkable to me. So is it ok to expect the next launch to be 100% successful then? Like I said, kinda spoiled with SpaceX's successes.
I saw three engines didn't fire at liftoff. Shortly after, a fourth engine flamed out. Then some moments later a fifth engine flamed out. The SpaceX/NASA feed showed status of the booster engines during flight and the graphic showed the non-firing engines and locations as they failed.
I was also surprised that the Starship and booster held together during the multiple flips and gyrations of the combined vehicle. Very sturdy craft!
I'd hope for the next launch to keep all 33 engines lit, and achieve stage separation. If they manage to light the Starship and not blow it up after stage separation, that's bonus.
That said ... I'll defer to what Elon Musk lays out as success criteria.