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He is now a tennis coach in California.
No. It is not a fighting technique. That being said, in a more general sense (and not a sense that people ever use the term "martial arts"), there is a potential martial (military) value to parkor. There is overlap between the two where breaking falls and rolling are concerned.
"I know not that which I cannot ever learn, therefore I should not try to learn these uncomprehendable things."
Calling someone "Master" is a common in Martial Arts. It's more a sign of respect than of subservients. However, it is debatable by some. Many martial arts instructors prefer a translation equivalent to "Teacher" in the respective language, such as "Sensei" in Japanese, "Sifu" in Chinese, "Sabeomnim" in Korean and so on. The belief is one truly never masters the martial arts as it is an ever learning experience.
I can find no information that this sculpture was ever attacked.