Ford switched to the E4DOA in diesel applications in '89. To my knowledge, there wasn't a diesel Ford sold with a C6 from the factory after '89, but someone could always swap one in if they so wished.
terible terible terible, send it my way, I'll pull that boat anchor and stuff it where no one will ever see it again, I may need to weld my hood shut, but you'll never see it again 
My guess would be that that was a typo. I've found a number of typos in my FSM's, to the point where I tend to think that Ford's quality control for paper products leaves a lot to be desired (ie. no proof-reading, or the proof-readers don't know their tailpipes from a hole in the ground). Some examples include the description on how to assemble the oil cooler (IIRC even in the '94 FSM, it still describes the 6-ring cooler setup, including how you have to put the small O-rings in the end caps before sliding the bundle in...which has burned a few people in the past; the 4-ring coolers require you to put the smll O-rings on the bundle), how to assemble the thermostat housing (saying to put the gasket on first, followed by the thermostat), and, according to the tranny codes, my truck had a T-18...
