They ship only this PSU in their new bundles (Antminer + PSU).
Are you saying you can't buy it separately?
His wording is a bit ambiguous but he means that they ship this instead of the old APW3++ in their miner bundles. Looking at the 13.5TH/S S9i with PSU listing confirms this:
7. Kindly note that APW7 instead of APW3++ will be included for this bundle.
I looked at the efficiency curve of the PSU and it seems the lowest you'd want to run the PSU at with a decent efficiency (~88%) 15A at 230V like you said, though you get a good bump-up to ~93% at 30A, and it reaches maximum efficiency at 60A at 230V (95%). Would post a chart but I'm on a phone and the image format isn't accepted by my image uploading site. Oh well.
On another note, Bitmain has released a mobile site for their shop (entire site and not just shop upon further notice?), and it's well organized with sections for PSUs, specific algo miners, etc- it's certainly a change I welcome as I browse their site often from a mobile device. Not sure how recent this was, but I just noticed this upon opening your link to the APW7.