The Differences Between Present Perfect and Present Perfect

The present perfect is a recent thing, and with the word just. But for us, particularly when you add these expressions like yet already and just, it seems even more important to put it in the present perfect. It's unusual for British ears, but we're used to hearing it from Americans. And sometimes I have to stop myself when I'm teaching online and I hear somebody say something like that. He ate too much chocolate. That's why he's sick. Do I need to correct this or not?