https://www.thailandmedical.news/news/study-shows-that-sars-cov-2-can-bind-to-amyloid-beta-fibrils

Coupling of SARS-CoV-2 to Aβ Amyloid Fibrils

https://pubs.acs.org/doi/epdf/10.1021/acsomega.3c08481

Looks like it can grab into the existing amyloid plaques. Could explain some of the instadementia.