Actually their “jab” was not an mRNA version.
In light of the newly documented risk, the Food and Drug Administration has updated the label of the vaccine to include a new warning: "Guillain-Barré Syndrome Reports of adverse events following use of the Janssen COVID-19 Vaccine under emergency use authorization suggest an increased risk of Guillain-Barré syndrome during the 42 days following vaccination."
https://www.npr.org/sections/coronavirus-live-updates/2021/07/12/1015366005/johnson-johnson-vaccine-is-linked-to-neurological-disorder-in-extremely-rare-cas
J&J Vaccine Gets Additional Warning on Bleeding Side Effect - The Food and Drug Administration said in a letter to the company on Tuesday that adverse-event reports suggested an increased risk of immune thrombocytopenia, or ITP, during the 42 days following vaccination. Symptoms include bruising or excessive or unusual bleeding, according to the agency.
https://www.bloomberg.com/news/articles/2022-01-11/j-j-vaccine-gets-additional-warning-on-bleeding-side-effect?leadSource=uverify%20wall