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The airplane could be momentarily upside down and passengers would not know.

At some point I suspect gravity would override the masking sense of motion that he talks about.

If the centrifugal force in the upward direction is 2g, that is, twice gravity, then passengers will feel like the plane is flying exactly upright and parallel with the earth.

Or the plane could be on a zero g simulating parabolic arc and at the same time doing a 1G barrel roll. A passenger with their eyes closed would think they are flying strait and level.

We have a bubble level in our heads for sensor. Not a gyro.

Even with a centripetal force of 137N (2g, 70kg), you'd think passengers would notice earth's gravitational pull circling them.

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