Pathfinder 2e General Discussion

Hi all! Relatively new (or new to PF2e) GM here. Last night one of my players who is playing a Summoner raised the question of whether he can attempt Treat Wounds twice every hour instead of once since his Eidolon is a separate target (ie. Someone treats the Summoner's wounds and then immediately treats the Eidolon's wounds). I ruled in the moment that I didn't think that sounded right, my reasoning being that they share a health pool and the PC shouldn't be able to double its benefits solely because of which class it is. Can anyone tell me what the RAW is here, ideally with an AON reference I can point him to?

Edit: I found this thread which seems to suggest that I made the wrong call. I'd love to have a more official answer, but I think the idea that healing is supposed to be trivialized by certain combos makes sense.