I don’t get it, they named every major smartphone maker (“Samsung, Xiaomi, Motorola, Vivo, Lenovo and Realme”) excluding Apple—if everyone gets to do exclusive launches, isn’t that the opposite of anti-trust?
The response is in your comment itself "every MAJOR smartphone maker".
That means both that minor makers or sellers were excluded. And also that major sellers had to abide but Amazon or Flipkart rules to stay in the program. For example by selling new models exclusively on these platforms.