I think that's a fair point you've made, at least in the context of web development. However there is a bit more to the picture. Without any disrespect towards the many excellent, highly skilled and deeply professional WDs out there, a company can be successful recruiting these for themselves because there are an awful lot to choose from.
Dominic Connor specialises in placing very, very highly paid quants with City firms. These are people with Maths and Physics PhDs, hardcore C++ expertise and expectations of salaries well into six figures. There are not that many of these people around at all and the services of a well-connected headhunter can make a hiring manager's job an awful lot easier.
He is right to hold candidates like this to a very high standard. He is also right to expect people wanting to break into this area to be consummately professional in every aspect of their working lives. Shoddy spelling on a CV is indicative of laziness and a slapdash attitude; that is not something to which you'd want to entrust millions of pounds. His candidates demand a lot and he is absolutely right to expect as much in return.
The rest of this isn't aimed so much at your comment as at the legions of chippy coders here who seem to think that they're being hired for their "technical skills" and that nothing else they do matters.
Communication with other people - with business managers, with traders, with others on the team - is vitally important. No techie works in a bubble and, like it or not, their coding skills won't save their jobs if they express yourself like a four year old.
The number of absolute rock-star coders, worldwide, whose skills are so intergalactic that they can get away with not washing and refusing to speak to colleagues is probably in the single digits. Unfortunately this attitude - I'm paid to write code, not docs; I'm too important to speak to Sales; the team revolves around ME - is all to prevalent among the millions of other developers whose skills, no matter how good, will never be enough to back up that kind of arrogance. Dominic's article is a welcome slap in the face to these kinds of people who, judging by the tone of many posts on here, still don't get it. Coincidentally, they won't get the high-paying jobs either.