I posted that picture for the fella that did the shooting. My initial reaction was similar to yours.
There was another head shot post where a young lady in pink 'trousers' did the shooting.
After posting the pic with my 'usual' comments the shooter emailed me anticipating the above comments, which are usual for the 'head' shot.
Personally I've made a few head shots in my time. Each was a chip shot, under 250 yards, that I KNEW I could make.
Of the two recent posts, I could sense strongly that the young lady knew what she was about. She's a chip of the old block. I could almost see the grin on her face as her dad gave her the point of aim. If you're head shooting squirrels at some distance why not use that confidence/skill on something as large as a deer. If this dad has done his job well, and I know that he has, as evidenced by the young lady's shot, there is definitely not a problem.
Regarding the shooter of the topic posting, this fella owns and manages an operation where he as plenty of shot opportunities and does a bunch of shooting. His shooting rig is top notch and I have a strong feeling that he is well experienced with the rig. Again definitely not a problem.
The other day my son and I were zeroing his new SIG 556 with the Eotech sight. We got her all done. I'd hung my horse shoeing hammer on the back stop then returned to the shooting bench. I just had to look through that nifty sight. Hmmmm, I says to myself, lemme take a shot. Back stop is at 100 yds. He says whatcha shooting at. I replied the top of the rail road tie. I saw just a glint of sun on the west side of the hammer handle. I'm confident that what was going through my mind was the same thing that went through the pink trousered young lady's mine with kind of a grin/smirk that can only be felt. Bang went the 223 and stuff flew. Observer tho't that the bullet had penetrated the tie. No way. He was looking for the "wound". I pointed to the hammer handle. There was the hole, perfectly centered, in the perfect spot on the length with only chips showing on the top of the handle. Why you're in the zone and know you can make the shot you can. It's just that way........
Bottom line, nothin' makes ya feel better than a head shot.