Cash flow matching vs Multiple liability immunization indicate, matching, liability, understand

John10

Please assist, I don't get the CFAI books anymore.

Question 13 of reading 28. The answers indicate that Cash flow matching has generally less risk than multiple liability immunization. When I read the text on page 44, first paragraph of 4.2.1. I understand that minimum immunization risk approach is better than cash flow matching.

Where do I go wrong?
Thanks for your help!