Parent was trying to let you know that it is available for cancellation before the year, essentially you can cancel at any time.

Their point was you might have erroneously assumed you had to make a decision now.

OK, seems like they changed their policy at some point and it no longer mentions pro-rated refunds:

"Paid members who haven't used their benefits are eligible for a full refund of the current membership period. We'll process the refund in three to five business days."

https://www.amazon.com/gp/help/customer/display.html?nodeId=...

I have received a pro-rated refund when I cancelled in the past.