I don't think this changes anything important, but my understanding is that the lowering is the scan -- you go through the ring, which captures data about the slice currently inside it. That gets you down to ~80s, which rounds to a minute (they say "about 5 cm/s").

Now, there's a lot of other reasons to be skeptical (e.g. there's no information on what all of this imaging could actually resolve), but please don't shoot the message.