Thanks for joining the community.
As you correctly state these particular models are not affected by the Intel Management Engine vulnerability. Actually what is really affected are the processors itself but the fix is applied to the BIOS in the board so that's why some board models show up listed.
For the processors affected go to: https://security-center.intel.com/advisory.aspx?intelid=intel-sa-00086&languageid=en-fr
And for the available fix got to: https://www.intel.com/content/www/us/en/support/articles/000026357/server-products.html?_ga=2.131571151.1954420935.1513297638-1829137013.1476322867
Hope this helps
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