Reading this, I realise my impression of Icke is based on the first part of his career, back before 1991, when he was a popular TV journalist and personality who was fired for his opposition to Margaret Thatcher's hated poll tax, and who then became an
important figure in the Green Party here in the UK, interested in New Age spirituality, before he suffered some sort of nervous breakdown which left him persuaded he was the "son of the Godhead" and spouting all sorts of prophetic nonsense, culminating in an catastrophic appearance on a prime-time chat show that really should never have been broadcast
After that, I was aware of his increasingly florid delusional structure via incredulous press reviews of his books (this is all pre-internet, remember, or before the internet became a major social and cultural presence), which concentrated in particular on his belief the Royal family, rather than anyone else, are shape shifting reptiles.
My mental picture of him is pretty much that that referenced by Warren Ellis'
John Constantine: Hellblazer #143: Telling Tales, which explains the
real reasons for both the assassination of JFK and the murder of Princess Diana:
I was delighted to discover you can read
the whole comic (indeed, the whole collection) online.
But that was 20 years ago, of course, and I'd not really registered what he's turned into, since I don't do Facebook and he doesn't feature in my parts of Twitter or YouTube.