Raping, stabbing and abusing people is still illegal in prison, you know. It isn't supposed to be part of the process. Assange isn't a violent offender either, so it'd be a little unfortunate if he was imprisoned with people who are.
Nobody is saying that the time he spent in the embassy should or could count towards his eventual prison sentences, but the 7 years he has spent there looks a lot like a self-imposed prison sentence.
> He also didn’t have to be counted five times a day, ... he woke up and went to sleep when he wanted, ate an array of foods
Those are clearly luxuries vs being imprisoned, but if that is the margin between being imprisoned or not the distinction is really irrelevant.
> Plus, he made a choice to enter the embassy and stay there.
So instead of accepting a state-controlled imprisonment he chose a voluntary period of conditions quite similar to being imprisoned. That is compelling evidence that he was serious about fearing extradition to the US to face whatever horrors they have in store for him.
I mean, objectively, if he believed he was just going to face rape charges in Sweden none of his choices make much sense. I doubt he was going to face more than 7 years for an offense that caused no injuries and that the victims didn't think was outrageously terrible at the time it happened. If he ever claimed his accusers weren't being truthful, the only compelling evidence is that there are two of them.