With "vibrating in a mode which is out of synch with our own" it looks like she is translating physics jargon into more colloquial terms.
A physicist would instead say "oscillating in a mode which is out of phase with the motion of the detector".
A teacher would explain the concept in terms of a child being pushed on a swing. If you are pushing at exactly the wrong time during every swing, there will be no energy transfer. When there is no energy transfer, you are blind to each other.
The jargon of science is one of her bugbears and she is trying to demystify it.