Thoughts on Ning Li & Eugene Podkletnov? 2 scientists who claimed to discover antigravity

I run a YouTube channel called The UFO report and am very much into UFOs. I’m making my next video on both of them and their supposed claims and how it connects to UFO technology. But, I wasn’t the best at math and therefore physics. So, I wanted to come to some experts and ask if they are seen as valid, or fringe science? Applicable/ realistic or sensationalized? Both of them did research using HTSD’s, and both observed a 2-3% weight reduction in objects. And the claim is that no one has bee...