Brain damage "from long Covid" seems to be primarily from vaccines, not the disease.

"In fact, Seneff said, brain damage from the vaccine may be more common than brain damage from the naturally acquired infection. Vaccine-induced spike proteins “get into the brain more easily than the virus does,” she said. “The virus only gets into the brain when a person has a compromised immune system. But the vaccine is injected into the muscle, which means it bypasses natural barriers that would normally keep the virus out of the brain.”

"In May 2021, Seneff and her colleague Dr. Greg Nigh, an oncologist based in Portland, Oregon, published a paper in the peer-reviewed International Journal of Vaccine Theory, Practice, and Research explaining their hypothesis that the mRNA vaccines may be worse than the disease itself."

"Since then, she said, she has been studying the reports of vaccine adverse events that are collected by the Centers for Disease Control and Prevention. In this new research, Seneff has found that 96 percent of all of the reported adverse outcomes in the year 2021 that have been related to neurological issues are connected to COVID vaccines. These adverse neurological events include memory disorders, mobility issues, difficulty swallowing, and loss of sense of smell."

https://m.theepochtimes.com/covid-19-linked-to-alzheimers-like-brain-changes-study-suggests_4379650.html