Earlier quoted context omitted.
This has always been his attitude; Sweden refused to interview him in the embassy.
I wouldn't say "always". For example, he left Sweden the day before he was due to be interviewed with a view to arrest. It should also be noted that Assange was finally interviewed in 2016 by Ingrid Isgren.
It was only once he was in the UK that Sweden decided, for no obvious reason at all, that the allegations maybe weren't bogus after all.