I think this fomat and procedure of following up is pertinent to a prospective middle to senior management positions, not for the supervisory/other category job interviews.
In these cases, especially in Indian scenario, the in-house HR agent (who generally is a single point of contact for the candidates) doesn't even have time to look at the faces :)
May be, the authour of this column is talking about some ideal scenario, or this article is just a text book stuff suited to not many of them.
Sorry, I didn't find it useful enough, as the senior management guys already know these things to write, what the author could have concentrated more on was the follow-up skills for the non-management candidates.
