There's also FTPS, which is FTP with TLS. That's closer to "secure FTP," but as @segmondy pointed out, this isn't what they use.
When I read it I thought the author was claiming plain FTP was secure too.
From wikipedia (http://en.wikipedia.org/wiki/File_Transfer_Protocol#Secure_F...) "The SSH file transfer protocol or secure FTP (SFTP)..."
Multiple google searches also yielded similar language.
http://www.differencebetween.net/technology/internet/differe...