Do we know this is really the case? I am skeptical about whether this guy had already discovered the vulnerability the day before the event. Fuzzing a browser c

Do we know this is really the case? I am skeptical about whether this guy had already discovered the vulnerability the day before the event. Fuzzing a browser can take a few hours running all the valgrind suites and analyze each failure can take a while. The article makes it seem he did it very quickly. What tools did he use? I am new to fuzzing browser.