That is "The Hobo’s Method" according to Ilya Pukhalski (source: http://www.smashingmagazine.com/2014/03/05/rethinking-respon... ) and I totally agree with him. That is not efficient way, even lazy way of creating responsive logos. The svg for each logo is repetitive and contains each logo variant - simple sprite technique is used and that is completely not innovative. The same effect could be achieved using png imag…
I think you've got it backwards. Joe Harrison first published responsiveicons.co.uk and the Smashing Magazine article is a later improvement on it. He didn't use the newer method because it wasn't around when he created the page.