I kow that the YDHT did not originate with Hancock, but with FIrestone, et al. I have known about the YDHT since its inception (2007) but the bit about the bollides falling for some 21 years was new to me. I will have to go back and find the original source on the bollides falling for that amount of time.
The problem with Hancock is, he takes existing work by real researchers, then just adds in stuff he makes up. Since he’s really just an author, trying to keep his next book in the current milieu is understandable — but that doesn’t make him reliable.