I think the intent is just: Are you in the middle of running an adventure and BAM! drow are needed. Use this statblock with the same CR!Again, I'm first in line to defend WotC, but I have to admit that this is a bit weird. How is a "Drow" equivalent a "Priest acolyte" or whatever? It doesn't match at all.
It isn't meant to say anything about actual drow.