That seems to be a gross misinterpretation of a graphic.
For one thing, the fact that you’re self-taught doesn’t mean you don’t have a degree. Another thing is “1 out of 10 developers are self-taught” and “9 out of 10 self-taught developers are never hired” are very different statements, and honestly, this specific graphics doesn’t address either statement
That same survey also had about 25% of professionals developers didn’t major in computer related fields. 32% of professional developer consider formal education being less than important, and 90% of them consider themselves at least partially self-taught.
How representative is the survey sample? I believe this says it all.
So beyond interpreting the graphics more realistically, also take the survey results with a grain of salt. Simple survey results and actual statistic are very different things