Is he? Can you provide a source?
Tim is actually called "formerly the worlds's second greatest detective, now the worlds's greatest detective" (Bruce had amnesia at that time) in Robin War #1, and Dick was called that afaik only in some sort of Who is Who, or Character Encyclopedia, and how canonic those books are is often really questionable.
Apparently
Robin War #1 (2016).jpg
The Boy Wonder #1 Preview
Writer: Juni Ba
Artist: Juni Ba
Gosh… Talia… looks so 70s
“Fleeing through the labyrinths with the hordes of the living dead fast upon them;
Once again they found themselves trapped in front of the abyss.”