If it smells like a rat....
For some reason everyone wants to make this story about the extradition treaty, but the facts seem pretty clear and he just seems to be trying anything to avoid facing the consequences of his actions. If he has some sort of evidence in his defence I'm sure he'll be acquitted, but the US has consistently proved better at trying fraud cases than the UK, so I can understand his attempt to avoid extradition.
Anyone who dealt with autonomy in the dotcom era has stories of things which seem sketchy. I remember being approached by them to buy their very expensive indexing thing. We didn't need it so I said no. They came back with this weird proposal where I buy some very expensive SAN disks (that I also didn't need) they would throw the indexing thing we didn't need in for free and I could write the disks off against tax. It just smelled dodgy so I refused. They tried to go around me via our CFO and I said in no uncertain terms that I wanted to go on record as having opposed the deal so they eventually went away.