I experimented with cutting EGR valve bodies off, unhooking them, installing a plate in it's place, and several other combinations before and after my EGR delete and have learned that when running stock my truck will throw a code for insufficient EGR flow unless there is a fully functioning EGR valve connected. While this code is set my boost pressure is approximately 6 psi less or about 19 psi at WOT.
As long as I have a fully functioning valve connected whether it is attached to the firewall with a plate in its place or installed in the intake the EGR code is not thrown and boost pressure is at normal levels of about 25 psi at WOT.
My boost pressure also maxes at 25 psi at WOT with a custom tune that has the EGR deleted.
This tells me that my truck only judges EGR flow by how far the EGR valve is open.

 

Correct me if I'm wrong but Turbo Fart is what you get when your turbo has built to much pressure to be used and it escapes back out of the intake and resonates in the filter box creating a farting sound. You can usually get it if you start off strong and then suddenly let off the pedal. Kind of sounds like a turbo blow off valve that you would hear in a ricer only throatier.

 

See above.

BTW, after clearing the codes, and more spirited driving, code did not come back.

Chalk it down to another piece of stray carbon getting stuck somewhere, jamming the EGR valve / etc.