I have a site that has not been regularly updated for several years.
However, due to it once being a good resource, it had a a few decent inbound links, but particularly several from a huge 'household name'. About a year ago it suddenly tanked in the SERPs. I didn't take too much notice, but upon checking recently I noticed that this site had changed all its, once static, outbound links to some convoluted procedure including 302 redirects.
Make of that what you will. But I think that links from this household name site had been pretty much responsible for my site's high ranking for the best part of a decade.