I still think it is better to look at Leonid Ouspensky's "The Meaning of Icons." Written by a theologian and an iconographer.
There are texts more ancient than that of Ouspensky, written by persons who were not merely theologians, but saints. If someone posted a link to Ouspensky, would you offer those as 'better' to look upon than his?
Quite frankly, I think that any site or text which offers us meaningful information and helps others to grow in understanding, knowledge, and appreciation of their faith is worthwhile and, barring error, ought to be considered a gift to us.
I've only had a chance to skim Father Economos' site, but what I've seen and read was both interesting and well-done. Thanks for sharing it with us.