I've been amazed by the extent of the problems, but as for the fact that he doesn't know what he's doing ... well, this is the person who explicitly declined the opportunity to do the due diligence process on his $44bn purchase.
Much of the third world has very limited data thoughput or even much client side processing capability on their phones. "Not understanding" graphql is irrelevant. The key is to make as few requests and bytes transfered as possible. It seems the twitter mobile app hasn't been optimised for that, no matter what protocol it uses.