I think you might be missing his point, as Atlas wasn’t mentioned anywhere in the lead up to your comment. Other than Hard Skool, the recent releases all feel incomplete due to repetitive and lazy lyrics in addition to some questionable production and mixing choices. They definitely feel like leftovers to me, even though I do really like Perhaps. If Perhaps was done during the Illusions I imagine someone would have assisted Axl with writing another verse or pushing him for another one before releasing it as is, but that’s just wishful thinking.
However, I do think the fact that we have Atlas and especially Monsters lends credibility to there being more of the so-called A list songs. I’m really interested in hearing a completed Oklahoma/Berlin, being that it was originally written by Axl.