Well if self-taught I pick someone who search online for courses or do their own struggle finding some sources to learn from so the ones I have seen so far are the great programmers.
Like you can take one programmer or I can say jack of all trades : Bucky Roberts. He has got his own youtube channel and website a kind of learning community (thenewboston.com). Taking all these points I will some what disagree with your point but overall as you said first we need to define self-taught term so I am agree with that as many are not that good programmers but in the same time you can't say self-taught are not good programmers.