Not anymore, in the last release thry switched to iCloud syncing.
IMAP is still supported.
But not for notes with the newer iOS 9 features like attachments.
Good to know, thanks. Will encrypted notes sync betweeen devices?
I doubt it. All the newer features (those introduced in iOS 9 like formatting) only work for notes stored in iCloud. The IMAP stuff seems to be deprecated/in transition.