Oh. If only he'd have done this thing that I'm telling you, without mentioning the well known reason why he is against doing that thing!
The UK was happy to extradite him to Sweden, we extradite people to the US as long as they aren't going to be executed. So quite why the UK extraditing him to Sweden who would then extradite him to the US is a plausible conspiracy never really gets explained.
Also weird this wasn't an argument he brought up while fighting the initial extradition to Sweden.
See the case of Gary McKinnon as an example (although McKinnon had much stronger grounds to appeal on than I expect Assange would)
As for the conspiracy theory, maybe it was the product of paranoid thinking. A more obvious conspiracy theory to me is that the US saw an opportunity to smear Assange and lent on Sweden to trump up the charges.
That's a pretty low bar for a smear campaign.
The "special relationship" is not a cover-all term for the US & UK to do anything on a promise like a teen couple in love. It covers a lot of military and trade stuff, which wikileaks is a part of, but in this case Sweden clearly acted as a player in a larger game. Assange seems to have presumed an ulterior motive in the charges brought against him and proceeded accordingly.