How did it work? Mr. Krone is alive.
The subject Mr. Krone decided to write about is the death penalty system not wrongful convictions.
Since Mr. Krone was not put to death the death penalty system works. And there is not a case anywhere where a person that could be proven innocent was put to death.
If Mr. Krone was writing about wrongful convictions then his points make mucho sense as do yours. But that's not his topic. What he and his attorney have written makes no arguements about the death penalty system.