He presented himself for questioning before he left Sweden. They told him he was free to leave. My understanding is that also Sweden will sometimes conduct such questioning via remote video link, but they have declined to do that in this case. It's been well over a year, it's not like they couldn't charge him without questioning if they wanted to.

I'm not really sure what's going down here, except it seems the least likely possibility is that Sweden wants to give him a fair trial for the sex allegations.