Originally posted by JuntaiYeah, everything is one now.
Even prior to that, Silver Age was already canon to post Crisis Superman (and others) after Infinite Crisis undid the knot in the time stream.That’s why when he met Legion of Superheroes in Johns run during the buildup to Final Crisis that he explained he hadn’t seen them since before the Crisis on Infinite Earths.
Line wide, many stories around this time and up until New52 would reference Silver Age stories with editors notes to those stories in the corner.
This just reaffirmed it for the modern blended continuity.