I wasn't able to pull up the video, but I might've had something similar on a pectinia. There were dozens, if not hundreds, of the tiniest pods crawling all over the tissue. The coral was receding and barely expanded. The previous owner tried several dips to no avail. What dips have you tried?
I got a sample of the pods and looked at them under a microscope. I wasn't able to ID them, but they looked like some of the other gray/black bugs in the hobby. I did a series treatment of Bayer dips about every 3 days for a few weeks. After that, the bugs were gone, and the coral started expanding and regrowing.
Maybe something in there will help. Keep us posted!