Can't say as I agree that epoxy primer is self etching. It doesn't have the acid in it that self etching primer has -- methacrylated phosphoric to be exact. Two part epoxy primer is best laid down over a media blasted surface -- preferably using aluminum oxide. It is water proof whereas the self etching primer is not. I've used self etching primer only to come back and find rust had reappeared -- much like lacquer based primers. I always remember, in high school, seeing the cars guys had gray primed, but waited too long to paint and rust began to show.
Epoxy primer will deteriorate if left exposed to the elements/sun.
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