Wilkinson is first rate on state formation but not so good on other things. There are errors in EDE wrt Osiris, etc.
Some of the reasoning in that article - which remember was written by a journalist - is dodgy. A "symbolic stairways to the stars" is fine but some of the other bits are pure ethnocentricity I'm afraid.
This:
"Where are all the steps that led up to pyramid building?" he asked. "We stand marvelling at these monuments and they seem to have appeared almost from nowhere, but clearly something like that cannot be put up overnight without the infrastructure in place."
looks like a misquote as the process from mastaba to step pyramid to true pyramid is well documented.
It's difficult to see the BenBen as a stellar symbol - read Quirke's "The cult of Ra" for the cunning linguistics.
AFAIK, "The high priest at Heliopolis was called "greatest of observers", a title that had astronomical links." is also incorrect. iirc the title was "chief of seers" - or variations on that theme, which referred to, what I can ethnocentrically call, fortune telling !
John