The problem was not that he doped the plywood, the problem is he attempted to use dope as the SOLE ADHESIVE in holding down the polyester fabric.
It wouldn't have worked any better with ceconite. While ceconite says to prime the wood with nitrate dope, it doesn't say to use dope as the adhesive. It says to use their cement. You can not bed any polyester fabric in dope (regardless of who made it) and expect it to stick structurally. This only works with the natural fibers because the dope wets into the fibers.

Of course, if you're not up on the materials enough to understand what will and will not work chemically and structurally, it would behoove you to follow the instructions rather than conjuring up some great conspiracy between the NTSB and the fabric manufacturers.