That’s about right. We overhauled that engine 3 years ago.
Ran it low,never checked it and is now cooked. Bet he kept driving with check gauges light on. Should have noticed when heat went away...
Last time I drove a truck that overheated, I could smell the anti freeze and feel it going wrong before it did. Shut it down and after it cooled, I found a freeze plug/ engine block heater slipped out.