Of course not. Why would you think it makes him a scamster? Again, his hiring was Mayer's poor judgment as to his competence. She hired him despite his "spotty record." There's no evidence he did anything wrong or dishonest.
More on the guy who got away with the big golden parachute from Yahoo. "Mr. de Castro, who was hired away from Google, was hardly a tech superstar. He had a spotty track record at the search giant. And less than a year before he left, he was demoted from managing media and platforms to an amorphous role working on 'special projects' on a team of one. Although he was promoted back into a bigger role several months later before jumping ship for Yahoo, it was not an auspicious sign for someone who was going to help turn around Yahoo." http://news.cnet.com/8301-1023_3-57617453-93/fired-yahoo-coo-de-castro-made-more-than-marissa/ http://news.cnet.com/8301-1023_3-57617453-93/fired-yahoo-coo-de-castro-made-more-than-marissa/ Still think he's not a scamster?
