You need to read that AEM warranty a little closer. The basic "Extended Modification Warranty" covers all the parts you listed:
Extended Modification Warranty Coverage Once the emission modification has been installed in your vehicle, MBUSA will extend your warranty coverage for certain emissions-related components.
Warranty Period: The warranty period for the “Extended Modification Warranty” shall be the greater of
: • 10 years from the date of initial sale or 120,000 miles on the odometer, whichever occurs first; OR • 4 years or 48,000 miles from the date on which the emission modification was performed, whichever occurs first.
Those parts with the parenthetical statement are ADITIONAL extended warranty items. For example, the DPF has the Extended Modification Warranty of 10 years/120,000 miles OR 4 years/48,000 miles; plus, additional 6 months and 6,000 miles. Thus, the DPF warranty on my 2012 Sprinter is the greater of: 10.5 years/126,000 miles or 4.5 years/54,000 miles.
If you go to the Mercedes-Benz Bluetec Update web site below and enter your VIN, you will get a link to another document that states the warranty clearer. I've attached a copy for your information.
VIN Lookup | Mercedes-Benz Bluetec Update (mbvans.com)
"The additional extended warranty is added to the applicable Extended Modification Warranty period"