It's pretty clear, given the resources being put into serving this warrant, that Sweden is going to charge him with at least some of these crimes regardless of

It's pretty clear, given the resources being put into serving this warrant, that Sweden is going to charge him with at least some of these crimes regardless of what he says (or doesn't say) during the interview. That's probably why they are conceding here. After all, even if he were successfully arrested and brought to Sweden, he could refuse to answer any questions during the interview. Once charges are filed, Ecuador will have to face the question of whether or not they want to be viewed by the world as shielding an accused rapist from justice. I'm just guessing here, but I see no scenario in which he doesn't eventually wind up in Sweden to face these charges (and if he did it, then he should IMO).