Is Civid-19 Vaccine causing fibrous blood clots?

The embalmer in this video sees abnormal fibrous blood clots in 50%  – 80% on the bodies he has embalmed this 2021.

https://blogs.mercola.com/sites/vitalvotes/archive/2022/01/31/embalmers-find-deceased-persons_1920_-veins-full-of-blood-clots.aspx