This came as quite a shock to me, not because I'm a fan. I'm not familiar with the work of this kind of group.
But to deny that AIDS and HIV are not dangerous... it's amazing that no one ever walked this back to reality:

https://www.themonthly.com.au/blog/martin-mckenzie-murray/2021/19/2021/1613697287/celebrity-misinformation 

 @014c1672 I couldn't read that article without logging in, but this one from 2019 suggests the band doesn't do it any more https://goat.com.au/health/dave-grohl-and-foo-fighters-show-how-you-walk-back-a-wild-move-like-backing-hiv-deniers/