Did you read your link? Ecuador was the one that shut him out and the questions were asked by a prosecutor from Ecuador.
>The questions were prepared by prosecutors in Sweden, where an arrest warrant for Mr. Assange was issued in 2010, but were posed by a prosecutor from Ecuador under an agreement the two countries made in August.
>“For some reason that I am not aware of, I am not on the list of approved persons that Ecuador has established,” Mr. Samuelsson told Radio Sweden.
The Swedish prosecutor has said that they hoped to get a sample of Assange's DNA during the interview, but since it was carried out by a prosecutor from Ecuador that seems unlikely and I haven't seen anything about them getting it.
>The questions were prepared by prosecutors in Sweden, where an arrest warrant for Mr. Assange was issued in 2010, but were posed by a prosecutor from Ecuador under an agreement the two countries made in August.
>“For some reason that I am not aware of, I am not on the list of approved persons that Ecuador has established,” Mr. Samuelsson told Radio Sweden.