The anti-gravity experiments are much older than 5 years. I remember buying and reading a book in the early 1970's detailing experiments by a group of Canadian scientists doing very similar experiments. And they had pretty much the same results. They used high speed rotating disks and spheres and documented reduction in gravitational forces above them. If there is any truth in anti-gravitation, then sooner or later someone will succeed in proving it.
After all, theories about atomic bombs and actual research preceded the 1st a-bomb by decades. Same for some other fantastic devices we now take for granted that were formerly dismissed as crackpot ideas.
What about Coral Castle at Homestead, Florida, which was built with some 20 and 30 ton coral blocks by a small Latvian man (Edward Leedskalnin) using gravitational levitation?
It is a known fact that magnetic points exist on the earth where this is possible.