There was no miss reporting. He stated that his gun was fire suppress. It makes no difference between a DI and piston where the fouling will be located when using a suppressor. It will go back toward the chamber and onto the bolt.
If is unsuppressed, the fouling in a piston rifle will be located in the piston and piston tube. In a DI it will be on the bolt.
My experience with suppress M4 is the gas blow through the charging handle into my eye. That is taking care of when you use gas sealant on the charging handle or buy a gas blocker charging handle.
It doesn't matter if there is excess fouling as long as it is lubed in an AR15 DI.
The US military has tested and rated the M16 with one jam for every 4000+ round fired.
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