sigh… correlation does not mean cause. there’s a multitude of factors that contribute to this. But if this is asking the question " Do companies hire self taught programmers?" This does not address that.
look at the reverse if you have if you have a PhD then only 2 out of 100 will be hired or 1 out of 50…really? Or that’s masters degrees get hired less than Bachelors? All this chart tells you is the formal education of people working in programming not to what extent it helped them get the job. Which according to this its better to never finish high school then to get a Phd.
ALSO this is stack overflow and despite the very good points above, one must also consider the demographics that use stack overflow as well as the type of people that take the time to fill out surveys. Cleary its not employed people as they are to busy.