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That makes no sense to me. If something is doing something, then it's automatically possible, which, if lacking another explanation, automatically means it could be evidence of aliens.

And, defying the known laws of physics isn't impossible, either. We can't even know how much we don't know. That leaves a lot of wiggle room.

I don't know "how" they do it, but those kind of motions do remind me of how AI agents move in computer games when unconstrained by the rules of physics.

perhaps some alien in another dimension was moving his mouse a different direction?

It doesn't violate the laws of physics, just of typical human aircraft engineering. The lack of visible thrust could be due to using interaction with the Earth's magnetic field[1] to generate thrust, as one random example.

1: https://en.wikipedia.org/wiki/Electrodynamic_tether