I hope the instructor is not still facing classes of kids somewhere. The article said

"The 36-year-old instructor, who owned a private judo club in Osaka, admitted he threw the boy excessively in training. The boy died in November last year from brain swelling, local reports said."

'Owned' is in past tense, but the article doesn't say that he quit teaching.
God grant me a good sword and no use for it. -- Polish proverb