Its not a new 52 reference. other then DC comics has been in love with 52 for ages.
if you pay attention, its everywhere.
Lance's callsign in Arrow. DC52.
starlabs van in The FLash star52
52 Earths's after infinite crisis. in 2005
"52" the weekly comic chronicling the year without the Trinity after Infinite Crisis.
The new 52 was those 52 earths being rewritten in the new timeline.
Again, really this is part of the "magic", and DC comics being totally selfaware. 52 is a magical number in the DC universe, because there are 52 weeks in a year, and 52 deliveries of comics.