From your link....conclusion....
...MMS related to autoimmune disease is a rare entity. The immunological mechanism plays the role of pathogenesis in this disease. Postvaccination exuberant cytokine activation and severe SIRS both act as the precipitating factors for the progression of MMA. It is noticeable to assess the vaccine safety surveillance and raise the alertness about moyamoya in patients with autoimmune diseases during the COVID-19 pandemic. Further studies for risk evaluation of COVID-19 vaccines in patients with autoimmune diseases might be required in the future....
:-(
Good catch.