I certainly haven't heard of that technique to get rid of bubbles in the cement.
They make industrial versions of the same specifically for concrete.
https://www.amazon.com/s?k=concrete+vibrator
Vibration? Thought it was pretty common.
I've seen people use the same technique and tooling for resin pours.
They make industrial versions of the same specifically for concrete.
https://www.amazon.com/s?k=concrete+vibrator