User blog comment:Supernatural145/The Arrowcave making no sense/@comment-27700324-20190114182225

lol Harley Quinn noticed the same thing in the Injustice comics. Harley Quinn has infiltrated the wiki!

In all seriousness though, this isn't something the show changed. Green Arrow always had an Arrowcave. Cause lets face it, he has always been Batman combined with Robin Hood.