It defers to a repealed 97/7/EC, replaced by 2011/83/EU:
> Durable media should enable the consumer to store the information for as long as it is necessary for him to protect his interests stemming from his relationship with the trader. Such media should include in particular paper, USB sticks, CD-ROMs, DVDs, memory cards or the hard disks of computers as well as e-mails.
USB sticks are on the list, but so is paper and e-mail. This USB stick could have been an e-mail.
> Durable media should enable the consumer to store the information for as long as it is necessary for him to protect his interests stemming from his relationship with the trader. Such media should include in particular paper, USB sticks, CD-ROMs, DVDs, memory cards or the hard disks of computers as well as e-mails.
USB sticks are on the list, but so is paper and e-mail. This USB stick could have been an e-mail.