Google Makes It Clear It Has Both Site Wide & Page Level Ranking Signals
Google has updated its guide to Google Search ranking systems to mention at the top of the page that it uses both page-level and site-wide signals for search rankings. There was a debate on this after the Google creator summit about Google possibly saying they only have page level signals, so this may clear things up a bit.
Our ranking systems are designed to work on the page level, using a variety of signals and systems to understand how to rank individual pages. Site-wide signals and classifiers are also used and contribute to our understanding of pages. Having some good site-wide signals does not mean that all content from a site will always rank highly, just as having some poor site-wide signals does not mean all the content from a site will rank poorly.
Google also noted here that they made this change to "make it easier for those interested to understand through our documentation that we have both page-level and site-wide signals used in ranking."
This comes after Glenn Gabe's monster of a post showing how Google has said they had site wide signals for years. This also proves that Google still does use site wide signals.