Technique is poor, look at knuckle near thumb sticking out, will break if he hits this way. Look at how he cocks his punch backwards telegraphing Suckers punch? Also, look at how punch finishes in circular motion. Breaking boards or bricks is meant to blast thru the target in straight line and focus past the object. His belt & execution of technique indicates his lack of experience. Room for improvement is key and ability to accept constructive critism. OK Grasshopper?

Robert Reuter, BS
Black Belt Karate age 16
Black Belt TKD age 19
Brown Belt Aikido