He said so himself, in an interaction with his fans. A fan asked him, if he will do a multi-starrer with Pawan Kalyan and the actor gave above mentioned answer.
The actor is ready to share screen with Ram Charan, Mahesh Babu, Jr. NTR and Prabhas too, but the script should be so strong that he feels the need to the film with them, it seems.
Pawan Kalyan and Mega Fans are hurt that Allu Arjun is looking to move away from "Mega family hero" recognition, these days. He openly commented on Pawan Fans behaviour and he did seem to be eager to beat Rangasthalam records when Ala Vaikuntapurramuloo appeared to be a massive success.
Eventually, it did beat Rangasthalam and became a Non-BB Industry Hit but Mega fans are hurt that Bunny showed aggression in claiming that status with AVPL than wait and be humble about it, in their vision.
Anyways, Allu Arjun like every star these days, said that he is open to multi-starrers and left it on scripts and writers to come up with strong stories. But is he trying to look for such scripts?