Not true at all. I went from "no computer science background" to a Django junior hire in ~10 weeks of (admittedly quite intense) self-study. I'm now employed as a mid-level programmer making very good money.
My anecdote is about as valid a characterization of whether it's possible in general as your sweeping, baseless generalization.
My anecdote is about as valid a characterization of whether it's possible in general as your sweeping, baseless generalization.