Hey, in the brochure it states that you can take a preparatory year course if the IELTS score is 5.0 or a preparatory semester if IELTS score is 5.5.
It also emphasizes that after the course you will receive a certificate using which you can enroll to a Saxion degree.
So, you will not have to retake the IELTS exam (as far as I understand)
If you have any further questions, contact internationaloffice@saxion.nl