It's a bodge, but a fine bodge!
As long as it didn't overheat or leak and the stud held what's the problem?
It's a 14 year old car that he obviously didn't think was worth changing the head.
I did a similar bodge on my old CBR600 when I snapped a stud when changing the downpipes. When I tried drilling the stud, my drill skidded off and into the head!
Hey ho, so I drilled a bit more and I was luckier than Eric as I missed the waterways. I tapped the hole and put a new stud in which was on a bit of a crazy angle!
But it held and it worked!