Why is this theory being applied to Aespa specifically? they don't have the same intensity of Blackpink's global appeal and they don't have their explosive views and streams, so to me it doesn't look like they are filling a void that Blackpink vacated.
What Aespa mainly have is an unprobable national hit, so i really don't see the correlation between Blackpink having a hiatus and south koreans falling in love with a catchy song from an attractive and talented GG coming from one of the biggest kpop companies. would Aespa's songs chart any worse if Blackpink released music in 2021? lol that's such a silly notion, it is not like no other GG could have successful hits around the same time as Blackpink before.
Finally, Aespa's subsequent songs charting well upon release -which indicates hightened interest and hype- after their national hit is a phenomenon as old as charts themselves.