The internet is full of crap, and the so called gurus talk most of it. All second-hand crap.
This phrase: humans are vibrational beings, on the surface is truth… but if you scratch it, it is unscientific, nonsensical, pretentious, and misleading. And misleading is the main tool of fakes, frauds, and impostors.
In quantum physics, the current state of knowledge in physics, everything depends on the observer: and a “thing” can be physical, or matter, or a wave… depending on the observer’s expectation.
I guess this is the basis of this stupid statement. If you look at yourself as a vibrational being, then you are… now what?