Correct, it isn't correlated, yet some people (ahem) in this thread have made that correlationDepth (or caring about such things) isn't necessarily correlated with number of races. Some DMs find it easier to build depth with fewer races, but it is a preference not a prerequisite.
I'd rather have depth than width, but if I could have both that would just be having my cake and eating it too.
It's just a question of style and every DM, every table, should do what makes sense for them.
In fact, IIRC one of our earlier disagreements was over this exact thing, where you attributed the OPs discomfort with weird races to a desire for "consistent believable worldbuilding" when nothing in the original post supports that.