If she isn't, she must be getting pretty close! Looking at Annichen's victories, I see one with an 7.5 minute margin. Wow!
I asked this same question 2 years ago; I think the consensus then was that she wasn't there yet. I think she is now.
Back in Annichen's day, there were just two races in the WOCs, and while A won most of them for several years, I think Simone's trick of winning every race she enters in 2 WOCs and gets another gold in a third is at least equal to A's accomplishments. Though that 7 1/2 min margin is incredible.
I think the top level of elite orienteering, at least on the women's side has improved since Annichen's day. When we were out for a run in Japan, Tom made a comment that, while Simone continues to get faster, the other women are keeping pace, so that Simone's winning margins are not growing.