I actually contacted Amazon US and here is a transcript of the chat (and no, the person REALLY WAS "Simon"!!!)
***
Simon: As II have checked and confirmed that this item is not available in the stock, However as soon as it gets available we will ship it and we´ll also send you the e-mail regarding that.
Me: Ok, I will keep my order active! There's a big mystery about this SACD release.
Was it ever in stock? That's the big question.
Simon: Yes.
And don´t worry I´ll also forward this request to our concern team and will make soon available in our stock.
Me: Great, thanks! btw, if you are Simon, where is Garfunkle? <joking 8')>
Simon: It will also get reflected asap, just kidding
Me: K, thanks! A lot of people are puzzled by how this item appears and then disappears and then appears again!
Simon: Don´t worry we´ll soon send you a confirmation regarding this.
***
Needless to say, that "Yes." was ambiguous @:
English may not be Simon's first language.
Simon may not be Simon's first name.
Simon may still be rhymin'.