Love my InReach.
Quick question: It says he hit his SOS button and shut down the unit.
Do you know what the result of this was?
Hard to say. If he waited for the indication that the message was sent and received, they would know where he was.
It also depends on the model (the oldest doens't have a screen and there's a new small one that doens't as well, so you need the phone app to read and send messages after sending the SOS), but if I actually had to use the SOS function on my inReach, I'd keep the unit on to get the response and send more info if needed.
Shutting it down soon after hitting the SOS wouldn't be very useful for finding the person. I'd only do it I knew they received it and my battery was low.
