Of course they are.
And had the defense forced a 3 & out to get the ball back, then the Chargers score twice & win, he becomes a jeenyus.
Not a terrible call to punt in that situation but I admit, I personally, would've done something different on 4th down. Fake the punt. Snap to short man & run it or simply run a good 4th down play to say Gates & try to pickup the 1st.
Lots of options. The 1 he chose didn't work out. That's why the head coach gets paid millions & it's a highly volatile position. Tough one.