I think the point was that, it took Marvel a decade of interconnected films to get those numbers.
Joker, Aquaman pretty much did a billion cold. Like sure Aquaman appears in BvS and is in...Justice League, but the movie functions as its own with a passing reference. Joker is completely standalone.
I mean, avengers 1 made 1.5 billion, that didnt take a decade and it's still quite a bit more than any DC film.
DC made what many consider the best CBM of all time in the dark knight and it didn't touch that.
Not trying to be negative or anything and sure it could happen I suppose I just don't personally see it, but I don't worry about that kind of stuff anyway.
For me, Shazam was a huge test for the DC brand, and while it was great, it didnt do much at the BO. It made less than I think all but the incredible hulk.
Wonder Woman 84 if it's great I could see clearing a billion. If the batman is great I could see doing a billion as well. And if they make a more universally loved superman film and manage to figure out all that and then get all them in 1 movie and that movie is great well, yeah, maybe DC can reach those heights.