Is DK Yoo strong as his videos show?

DK Yoo is a South Korean martial arts master, 
he claims to have practiced more than 10 martial 
arts, He has many videos on YouTube and Facebook 
that shows his techniques.




He is giving many seminars to teach the art by using 
techniques from all the martial arts he did learn.
Physically he does not look like a big guy, his height 
is normal, and no big muscles, but when he demonstrate 
his techniques, we can see how he can control a good 
amount of energy when he attacks or defends, but 
is this he really too strong?




there is a question that everyone asks when they see 
someone demonstrating great power or much strength 
or undefeated technique, which is: why don't you show 
that in a real fight such as in MMA?
We can not of course answer this question but only 
him can, if he accepts to fight in a real fight.
lets watch the video