Since the workload is not the issue- maybe transferring so quickly is not a great idea. Keep in mind, coming in as a transfer is not the easiest way to make friends either.
Did he join any clubs that interest him? I always find that’s a great way to make friends with common interests. I’m a sophomore now and definitely made more friends towards the end of freshman year. Most of my friends are in the same clubs/activities as me.
Does he like sports, working out, music? That’s another great way to meet people.
How about Pre-law society? Mock trial?
I wouldn’t give up all that $$$ and Ivy so quickly. I would give it until the end of the year and exhaust all possibilities. He could be homesick and thinking about HS friends etc.