I’m not competent to comment on the article except to say that the occurrence of clotting in relation to mRNA vaccines (Moderna and Pfizer) is much lower than that of viral vectored vaccines (AstraZeneca and Johnson & Johnson). The YouTube channel, Biblical Genetics, has provided excellent coverage of related issues. RNA Vaccines Pros and Cons is a good overview of the science behind mRNA vaccines. Fetal Tissue Research is an ongoing series about the ethical and moral concerns with practices such as using aborted fetus cell lines for vaccine research and manufacturing.